Of those, I'm most excited about the bottom three and really hope they appear - they are the three I will use the most and already have online championship series provisionally planned.
Of the three tracks mentioned I think Fiorano is the most likely and I'm not very excited about that one as it is probably too narrow for good online racing.
I've just finished reading the superb book "Hobbo" the autobiography of David Hobbs. For those not familiar - he had a 31 year pro racing career during which he competed all over the world in a huge variety of single seaters, saloons and sports cars. I was amazed to find at the back of the book that as well as favourite co-drivers he also lists his top ten favourite racing cars and tracks - drawn from the many, many that he drove. If I was SMS I would use David Hobbs suggestions for a special DLC pack (a lot of his suggestions are already in the game) - the pack would look like this:
Track 1 Mosport (now called Canadian Tire Motorsport Park), Ontario, Canada. 2.459 mile road course 1961- current.
Track 2 Kyalami (Classic Kyalami 1961 - 1987) 2.55 miles, South Africa
Car 1 (his number 1) Ford GT40 MK1 (1965-69) - Vintage Prototype B
Car 2 McLaren M10B Formula 5000 (his number 3) - 1971
Car 3 Lola T330 Formula 5000 (his number 4)
Car 4 March BMW Sports Prototype 1986 IMSA GTP (his number 6)
Car 5 Lotus Elite (1957-63) - GTC (his number 7)
Car 6 Jaguar XJ13 (1966) - Vintage prototype B (his number 9)
Car 7 Lola T70 Spyder - Vintage prototype B - his number 10 (It would compete in game with the Lotus 40 - I would split these two cars off into an early Can Am class as they did not compete with the other cars in VPB).
It could be possible to do other DLC packs curated from the suggestions of Motorsport Legends - Stirling Moss, Dieter Quester, Brian Redman and Henri Pescarolo spring to mind!