So what license does GT5 have with NASCAR? Is that just a one-time deal or are they planning on no exclusive deal with the sport?

The really weird part with EA and the NASCAR license is that in the year before losing/dropping the license, EA had plans to build a studio in North Carolina pretty much solely for the NASCAR franchise and better access to the sport. From what I've read, it sounds like the NASCAR devs at Tiburon were shifted to other games (including new IP EA SPORTS MMA) and then the franchise was gone.