Let's go simply by PD stats/numbers, nothing else. No assumptions, no guessing, just pure PD numbers on the latest version of their website.
Ok so for GT5 their website states:
Includes 31 locations with 81 layouts. Some tracks are affected by time and weather changes.
It then lists those locations and variations. They include the four DLC locations and include reverse tracks as layouts but they don't use time/weather as seperate layouts.
Locations:
- Fuji Speedway
- Suzuka Circuit
- Daytona
- Tsukuba
- Circuit De La Sarthe
- Nurburgring
- Indianapolis
- Monza
- Top Gear Test Track
- Laguna Seca
- Spa Francorchamps
- Motegi
- High Speed Ring
- Cape Ring
- Autumn Ring
- Deep Forest Raceway
- Grand Valley Speedway
- Eiger Nordwand
- Trial Mountain
- Kart Space
- Special Stage Route X
- London
- Rome
- Madrid
- Tokyo R246
- Cote d'Azur
- Special Stage Route 5
- Special Stage Route 7
- Eiger Nordwand (Snow & Dirt)
- Toscana
- Chamonix
Layouts:
- Fuji Speedway F
- Fuji Speedway GT
- Suzuka Circuit
- Suzuka Circuit East Course
- Superspeedway - Daytona
- Road Course - Daytona
- Tsukuba Circuit
- Circuit de la Sarthe 2009
- Circuit de la Sarthe 2009 (No Chicanes)
- Circuit de la Sarthe 2005
- Circuit de la Sarthe 2005 (No Chicanes)
- Nürburgring - Nordschleife
- Nürburgring GP / F
- Nürburgring 24h
- Nürburgring GP / D
- Nürburgring Type V
- Superspeedway - Indy
- Road Course - Indy
- Autodromo Nazionale Monza
- Autodromo Nazionale Monza No Chicanes
- The Top Gear Test Track
- Laguna Seca Raceway
- Circuit de Spa-Francorchamps
- Road Course - Twin Ring Motegi
- Twin Ring Motegi West Course
- Twin Ring Motegi East Course
- Super Speedway - Twin Ring Motegi
- High Speed Ring
- High Speed Ring / Reverse
- Cape Ring
- Cape Ring Inside
- Cape Ring North
- Cape Ring Perifery
- Cape Ring South
- Autumn Ring
- Autumn Ring / Reverse
- Autumn Ring Mini
- Autumn Ring Mini / Reverse
- Deep Forest Raceway
- Deep Forest Raceway / Reverse
- Grand Valley Speedway
- Grand Valley Speedway / Reverse
- Grand Valley East
- Grand Valley East / Reverse
- Eiger Nordwand Short Track
- Eiger Nordwand Short Track / Reverse
- Trial Mountain Circuit
- Trial Mountain Circuit / Reverse
- Kart Space I
- Kart Space I / Reverse
- Kart Space II
- Kart Space II / Reverse
- Special Stage Route X Oval
- London
- London / Reverse
- Rome
- Rome / Reverse
- Circuito de Madrid
- Circuito de Madrid / Reverse
- Circuito de Madrid Mini
- Circuito de Madrid Mini / Reverse
- Tokyo R246
- Tokyo R246 / Reverse
- Côte d'Azur
- Special Stage Route 5 / Night
- Special Stage Route 5 / Reverse / Night
- Clubman Stage Route 5 / Night
- Clubman Stage Route 5 / Reverse / Nigh
- Special Stage Route 7 / Night
- Eiger Nordwand K Trail
- Eiger Nordwand K Trail / Reverse
- Eiger Nordwand G Trail
- Eiger Nordwand G Trail / Reverse
- Eiger Nordwand W Trail
- Eiger Nordwand W Trail / Reverse
- Toscana
- Toscana / Reverse
- Chamonix Main
- Chamonix East
- Chamonix West
- Chamonix Mini
Ok that is the latest, official list for GT5 by PD as of today. Those are the official designations for layouts and tracks. 31 Locations, 81 Layouts.
Now onto GT6.
The UKs famous Silverstone Circuit will be just one of seven new locations in Gran Turismo 6, taking the total to 33, with 71 different layouts available, 19 of them brand new
Ok so straight away those pure numbers do not add up. If the total were now 33 that is only an increase of two, not seven. Also the number of layouts is a lot less despite the claims that 19 are brand new so clearly their goalposts on what is a layout changes. Sometime it includes a time/weather change, sometimes it includes a reverse track. So now is where we have to break away from official numbers slightly but still not using any guessing to work out how they got to those numbers. First of all locations. They claim 33 and that seven are new, that obviously means they're suggesting that there are only 26 layouts in GT5.
So using their official, latest designation of what is a layout, how do we get to that number from their current 31? Well we can remove the four DLC locations
Locations:
- Fuji Speedway
- Suzuka Circuit
- Daytona
- Tsukuba
- Circuit De La Sarthe
- Nurburgring
- Indianapolis
- Monza
- Top Gear Test Track
- Laguna Seca
- High Speed Ring
- Cape Ring
- Autumn Ring
- Deep Forest Raceway
- Grand Valley Speedway
- Eiger Nordwand
- Trial Mountain
- London
- Rome
- Madrid
- Tokyo R246
- Cote d'Azur
- Special Stage Route 5
- Special Stage Route 7
- Eiger Nordwand (Snow & Dirt)
- Toscana
- Chamonix
As that seems the logical first step but as has been mentioned before, this leaves us with still one more than they claim. Somewhere then clearly PD are mixing up numbers or again changing the goalposts on what is a location. Since PD also openly state that
ALL GT5 tracks will return SHIRAKAWA's explanation seems the most plausible. We can't remove a unique location so it has to be that they're merging the two Eiger Nordwand locations, currently listed twice. That is the most logical way that PD have got to 26 locations in GT5.
So what can we take from that? Well it's very simple, if they're not counting DLC locations as current GT5 locations that doesn't mean they're automatically in the "All GT5 tracks will return category", and they may not return, at least on the disc.
So in conclusion I see there are only three possible situations going only by PDs numbers and one small assumption:
A. All of the current 31 locations including DLC locations are returning to GT6 on the disc, renumbered as 30 through merging the Eiger locations into one. The further three locations to get to the number 33 are brand new.
B. Only the 27 original locations of GT5 are returning to GT6 on the disc, renumbered to 26 through merging the Eiger locations into one. The further seven locations to get to the number 33 are brand new and the four GT5 DLC tracks are not returning at all.
C. Only the 27 original locations of GT5 are returning to GT6 on the disc, renumbered to 26 through merging the Eiger locations into one. The further seven locations to get to the number 33 are brand new and the four GT5 DLC tracks will continue as DLC for GT6. They will not be on the disc.
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Ok now layouts.
For GT6:
71 different layouts available, 19 of them brand new
For GT5:
Includes 31 locations with 81 layouts. Some tracks are affected by time and weather changes.
Again clearly these numbers do not match, them saying GT5 already has ten layouts more than GT6 will, despite also saying 19 are brand new. So from the GT6 statement they're actually changing the GT5 number to 52. Again we have to now make some assumptions how they came to that number but the most logical are again removing the DLC layouts. That still leaves us at 71 however so the next logical step is removing the reverse layouts
- Fuji Speedway F
- Fuji Speedway GT
- Suzuka Circuit
- Suzuka Circuit East Course
- Superspeedway - Daytona
- Road Course - Daytona
- Tsukuba Circuit
- Circuit de la Sarthe 2009
- Circuit de la Sarthe 2009 (No Chicanes)
- Circuit de la Sarthe 2005
- Circuit de la Sarthe 2005 (No Chicanes)
- Nürburgring - Nordschleife
- Nürburgring GP / F
- Nürburgring 24h
- Nürburgring GP / D
- Nürburgring Type V
- Superspeedway - Indy
- Road Course - Indy
- Autodromo Nazionale Monza
- Autodromo Nazionale Monza No Chicanes
- The Top Gear Test Track
- Laguna Seca Raceway
- High Speed Ring
- Cape Ring
- Cape Ring Inside
- Cape Ring North
- Cape Ring Perifery
- Cape Ring South
- Autumn Ring
- Autumn Ring Mini
- Deep Forest Raceway
- Grand Valley Speedway
- Grand Valley East
- Eiger Nordwand Short Track
- Trial Mountain Circuit
- London
- Rome
- Circuito de Madrid
- Circuito de Madrid Mini
- Tokyo R246
- Côte d'Azur
- Special Stage Route 5 / Night
- Clubman Stage Route 5 / Night
- Special Stage Route 7 / Night
- Eiger Nordwand K Trail
- Eiger Nordwand G Trail
- Eiger Nordwand W Trail
- Toscana
- Chamonix Main
- Chamonix East
- Chamonix West
- Chamonix Mini
As you can see that gets us to the correct 52 number. So now again we can decree something similar to the locations. Either they're all coming back including DLC, renumbered to 61 and there are actually only 10 new layouts, the DLC layouts are not returning at all or they are remaining as DLC and there are indeed 17 new layouts.