I've just emailed EB Games to ask why they haven't updated their webpage.
No matter what when you pre order it, you get the five cars: Viper, C7, Tesla, GTR GT3, and the R8 LMS. When you get the anniversary edition, you get 20 more cars from GameStop.
Yet EB Games has different cars listed as to what is mentioned on the Gran Turismo website.
EB Games:
BMW Z4 GT3 '11
Nissan GT-R NISMO GT3 N24 Schulze Motorsport '13
Chevrolet Corvette Stingray (C7) '14
Tesla Model S Signature Performance '13
Alfa Romeo TZ3 Stradale '11
Alpine A110 1600S '68
Aston Martin V12 Vantage '10
Audi R8 LMS ultra (Audi Sport Team Phoenix) #3 '12
Ford Focus ST '13
Ford Mustang Shelby GT500 '13
Honda weider HSV-010 (SUPER GT) '11
KTM X-BOW R
Lamborghini Aventador LP 700-4 '11
Lexus IS F Racing Concept '08
Lotus Europa (type54) '68
Mercedes-Benz SLS AMG GT3 '11
Renault Sport Megane Trophy V6 Race Car '11
SRT Viper GTS '13
TRD 86 Racing '08
Volkswagen Scirocco GT24 Race Car '08
Gran Turismo/GameStop:
Alpine A110 1600S 15th Anniversary Edition
Audi R18 TDI 15th Anniversary Edition
Audi R8 LMS ultra 15th Anniversary Edition
Audi Sport quattro S1 Rally Car 15th Anniversary Edition
BMW Z8 15th Anniversary Edition
Chevrolet Corvette Coupe (C2) 15th Anniversary Edition
Chevrolet Corvette Stingray (C7) 15th Anniversary Edition
Cizeta V16T 15th Anniversary Edition
Ford Focus ST 15th Anniversary Edition
Ford GT40 Mark I 15th Anniversary Edition
Ford Shelby GT500 15th Anniversary Edition
Honda HSV-010 GT 15th Anniversary Edition
KTM X-BOW R 15th Anniversary Edition
Lancia STRATOS 15th Anniversary Edition
Lexus IS F Racing Concept 15th Anniversary Edition
Lotus Europa S.2 15th Anniversary Edition
Mercedes SLS AMG GT3 15th Anniversary Edition
Nissan GT-R NISMO GT3 15th Anniversary Edition
Pagani Huayra 15th Anniversary Edition
Renault Sport Megane Trophy V6 15th Anniversary Edition
Shelby Cobra Daytona Coupe 15th Anniversary Edition
SRT Viper GTS 15th Anniversary Edition
Tesla Model S Signature Performance 15th Anniversary Edition
Toyota 86 GT 15th Anniversary Edition
Scirocco GT24 15th Anniversary Editio