After what Epic did, I'm pretty sure that nintendo are not willing to go after then. They grabed support from the one that atleast are tryng to support in someway, like crytek and unity, But Epic put out pretty clear what they think of WiiU:
http://kotaku.com/the-wii-u-wont-be-getting-unreal-engine-4-update-462919060
Nintendo can count with the indies, but that about it. Everything else is lost at this point.
"Hardware design isn’t about making the most powerful thing you can.
Today most hardware design is left to other companies, but when you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective."
Gunpei Yoko
