Yamaha's new R1 has earned lots of attention and is set to put the tuning-fork company back on the superbike map. At the same time, Aprilia, BMW, and Ducati have all executed major updates for the RSV4, S1000RR, and flagship (now 1299) Panigale, respectively. To ice that moist, superbike cake, we threw Kawasaki's ZX-10R into the mix, too. Will the Kawasaki show that progress is incremental and prove a worthy adversary for this class? Or will it be overrun by these four, fresh contenders?