Its finally out, after a hefty 9 day approval, unity has accepted the 1.08 update.
It features a heap of motorbike animations, and a small controller demo scene to help you get started with mecanim. The small controller scene features layers (for weapons), 2d locomotion blending between motions (running fwd, back, left and right) and how to time a jump motion for the right leg only. Good stuff!!