they are not coming out with a new car, just a new front end (kinda different than all of the other companies, but the chassis's are both solid and proven, and really dont need much improvement, and then again there arent many things you can do). the front end will pretty much work on any car (speedmerchant or not) out there, the only thing that will be diferent for non speedmerchant cars is the piece that mounts onto the chassis.
if you can run 4 cell mod i would highly suggest it, since you will be faster (less weight) and with a track like that which requirs quick transitions i would highly suggest it. can you run 3300's? (since the GP's are probably cheaper than the packs you are currently running) if so i would highly suggest it, and maybe run a 19t motor instead of a full blown mod if you are still dumping.