It is likely that, since the Wii U is a new console released by a company that has de-emphasized graphics, near launch games that are being produced on a tight budget and timeline do not represent the pinnacle of graphical quality for the system ...
How much graphics improve will depend on how much effort developers put into improving graphics, which depends on how well the system sells and how powerful other next generation systems are. If the Wii U sells moderately well, and the next generation consoles are more powerful, developers will put a greater effort into producing improved visuals on the Wii U (possibly just to make developing games for all platforms easier)








