Matt Prior, the producer of FIFA 13, stated that FIFA 13 will actually look the best graphically. The Wii version will have some extra graphical highlights to make the Wii U version look better.
It’s not going to be miles ahead, but two things we have improved just in terms of the fidelity and quality are the pitch. If you have a look at the pitch texture there’s a lot more detail in it and we’re working on that as we speak to hopefully improve it even further.
One of the common complaints is the crowd, and if you look at the crowd on the Wii U it’s double the resolution.
The Nintendo Wii U version of FIFA 13 will have a better looking field and crowd. At least they are actually trying to make the Wii U version look good instead of just throwing something together.