It will be easier to port from PS4 to Wii U, than PS3 to Wii U.

[IsawYoshi]

Says this guy:

http://www.youtube.com/watch?v=JE4GkcKQvLg

 

I really recomend to watch it, he pust up some interesting points. For the ps4 to wii u porting is easier than ps3 to wii u part, you can go to about 9 minutes out in the video, but I recommend to watch it all. The general ideo is a comparison of the ps4 cpu and the wii u cpu.