No official announcement on Forza 2 car list but here is what is expected so far
http://www.forzacentral.com/forum/sh...ad.php?t=12371
including
BMW
Z8 (2000)
BMW Motorsport
#2 Team BMW Motorsport M3-GTR (2005)
M3-GTR Street Version (2002)
M 635 CSi (E24) (race version)