Some framerate issue have more to deal with platform optimization. You can find PC gamers with fairly powerful rigs encountering the same issues.
It's pretty obvious which platforms you're going to polish for.
Gotta wonder too about performance difference b/w WiiU dev kits and the retail SKUs. The WiiU has some extra stuff running in the background the dev kit probably doesn't.
I predict NX launches in 2017 - not 2016