I'm sorry, but if you don't consider WiiU in the same category as PS4/XBOne, then you need to GTFO.
There is no technical reason WiiU won't get any 3rd party game. There is no technical reason WiiU can't run the same engines.
For EA its a matter of personal issue and where they want DRM to go, not technical with DICE's FrostByte engine.
Any other engine just hasn't been default coded. Hopefully Nintendo will take up the task if the engine is big enough to warrant their personal level of support.







