i think that there should be more cars from 2015. there is no reason that the only modern muscle car for 2015 should be the mustang, especially since the release of the 2015 Challenger/Charger Hellcat, the 2015 SRT viper, and even the 2015 Comaro ZL1. modern muscle is in a battle for 2015 and with a game as good as FH2, this would defiantly be a fun competition.
http://forums.forza.net/turn10_postst15345_FH2-Car-Wish-List.aspx pinned near the top of this forum.