OK guys, seriously, tessellation unit doesn't mean shit for graphics without polygon pushing power, all it does is slow shit down unless you implement it in a way to save resources and work, it's meant as a tool for devs to do less work yet able to bring out more detailed objects in a 3D environment, which most likely won't be used for multiplatform games in general.
Also, Power 7 based CPUs have 4 threads per core, so if the Wii U has a tri-core, it'd have 12 threads, which would burn some rubber.