Ubisofts MMO will come to the Wii U if they want it to. Anything this early on could easily be Wii U games. When Unreal 4 becomes the defacto engine and the nextbox and PS4 are out a few years then you might start worrying.
At this point every game being made thats multiplatform could come to the Wii U if developers want to take the time. Sadly its upto Wii U owners to show that they want the effort done or the well will dry
... Did you just confirm that Wii U isn't getting UE4? If so, then it really is a current-gen system. (My standard for next-gen is running next-gen engines.)