Sport Compact Car says the action is going to take place in the US and Mexico. Of course in the Fast and Furious movies , the cars are the stars , so what are they saying about the stars ? Either a 1987 Buick GNX , 1969 Chevy Camaro for Vin. They say a 2009 GT-R is an obvious choice for Paul Walker. By a well educated guess, I don’t see the GNX making it, Its not a V8, no turbo 6 Buick GNX for those guys. As far as a new GT-R , I don’t think they have anything setup yet, although there are rumors that the production has looked at a number of R34’s. 
Fast and Furious 4. I bet you can’t wait to see it. I have been hearing the rumors, seen the stories (like this months Sport Compact Car about it. Supposedly Paul Walker and Vin Diesel are back for the fourth installment.