Well, WiiU of course lack the processing power/graphics capabilities and amount/speed of RAM of PS4, and multiplatform games on WiiU will be downgraded on the Nintendo Console compared to PS4/X720. All future multiplatform games will be conceived with PS4/X720/PC in mind, with PS360/WiiU getting a very downgraded version. Also, I noticed that many 3rd party devs don't consider a lot WiiU, as happened with Wii also. After GameCube, Nintendo are just releasing "next gen" system which are sligthly more powerful than previous gen.
I miss so much the Nintendo64/GC era, damn you Nintendo !