There's some speculation about the Aston Martin Cygnet being in the pack.
Carlos Sainz is a new clue. Of course everyone is speculating that it is about a Celica, either the ST165 or the ST185 (both were in the Forzalopnik surveys).
A very successful V8 powered race car is another clue. I'd kill for the Mercedes Sauber C9 or another Group C car to be the answer to this one !
I guess the Corvette GT2 could be right too but IIRC, BADNED said that we wouldn't get it due to technical stuff.
Edit : Beaten on the new clues.