Hi guys, I know that these aren't really official confirmations, but I hope I'm allowed to mention them in this thread. If you watch the "Forza Motorsport 5 EGX 2013 Developer Session" video, you can see what seems to be a picture of a Subaru Impreza WRC2008 on the icon of the "Production Rally" championship series. Still, there's the possibility that it's actually just a 2008 WRX STI fitted with the World Rally Car bumpers - nobody knows for sure. There's also a picture of a Honda Civic Type R (FN2), a Ford Focus RS (2nd gen), a Honda S2000, and a Mazda MX-5 Miata. (not sure either first or second gen.)
See 7:38 from the video for clarification.
At 08:38 you can also see a picture of the Lamborghini Murciélago LP670-4 SV.
It feels a bit strange that they used a picture of the FN2 Type R to represent the "Early Hot Hatch" championship series. It's not really an early one, isn't it. Shouldn't it be more fitting if they used a picture of the Rabbit GTI or the 205 Turbo 16 instead? Still up to different interpretations, though.