I spent hours on my desktop last night. I was searching for leaked info about GTA V. I stumbled upon a website which gave me some information about vehicles in the HD Era (GTA V).
I will keep the name of the website undisclosed for now.
Obviously you've all seen both trailer 1 and 2 of GTA V. In both the trailers, there is a vehicle that closely resembles the Audi R8 Spyder.
The name of this vehicle is the 9F. That's all the information i'll post for now. The car brand that it is made by has not yet been released. Only the name of the vehicle has been released. 9F Probably comes from the actual real-life name "R8".
Also, in the 1st Trailer, if you see a Jeep-Style vehicle, that's a new Mesa.
I hope this isn't a spoiler for all you surprise-seeking gamers out there!