Check this, allegedly a PROPER list (and reading it it seems more realistic than the ones so far...) of the cars in the JAP version of GT4.

http://www.gtplanet.net/forum/showthread.php?t=52577

RS200s, Escort Rally Car, EVEN FocusRSs and ST170s, but NO cossies or RSTs as such (Cant belive the RS500 would be ignored!)

But there still Lotus Carltons, Reno5Turbos, Maxi5Turbo2s, BMW 2002Turbos, and even some proper D1 cars, so still

No Pulsar GTIRs either, which is well strange considering some of the heaps of crap theyve included

Dont forget they "might" change some cars for the UK release date. No RS500 is madness when you think how famous they are