So I found some interesting things as I was digging around on the gran-turismo.com servers for track logos.
Their server has the directory listing disabled for the place where all the course logos are stored, so I had to find a different way to get them all.
Here's a URL for one of the images:
https://us.gran-turismo.com/common/images/gt5/remote_race/common/courselogo/6a79bdcea1ea337e9bff99eb4289e376.png
Now that filename is pretty recognizable as an MD5 hash. Through some brute-forcing, I figured out that the hashes were of a simple naming pattern. I saw names like "sarthe," "route5," "laguna," "daytona," and so on. But, I wondered why they were using hashes for these. Couldn't they use the names themselves, or simple numbers?
So I did some Googling and I came across
this list of track codes. I converted that entire list back into MD5s and downloaded the images. Here's what I found.
The following codes don't have images for them on the server, which means that the codes have changed or that some of the tracks have been abandoned:
Code:
fisco_old
fisco_slalom
infineon_nascar
motegi_east
motegi_west
oval
sarthe24
suzuka_west
testcourse
And here are course logos for tracks which would be new to GT5. Logo on the left, code on the right:
: 20r60r
: apricot
: assisi
: capri
: grandcanyon
: hongkong
: icerace
: infineon
: kashiwa
: lasvegas
: midfield
: motegi
: newyork
: paris_rally
: paris_tarmac
: seattle
: seoul
: smtsouth
: tahiti_maze
: valencia
: yosemite
: yosemite_dirt
: yosemite_dirt_mini
: yosemite_dirt_short
It could be that they were just uploading images for all the race codes they had, and that these images were just dumped on the server as a batch. But what's exciting about this is that there is a hope that perhaps these tracks could make it into GT5 in the future.
EDIT: Found another:
: super_speedway
EDIT 2: Our friendly neighborhood
squadjot has found two more track logos!
: campo
: grandcanyon_north