Not SUPERbike!!! But some simple, lite and maneuvrable bike would be good in future Far Cry! Escaping enemies in the forest, riding a bike, would be great, for example. All those vehicles are rather clumsy. Don't underestimate a bike and its capabilities!
I would like more vehicles (in the same way others want more weapons) but it would have to be in keeping with the game. Superbikes and upgrades wouldn't feel right, but more vehicles defitnatley welcome. Sheriff / Patrol car with siren would be a good addition.