The Wii is considerably more powerful than the most powerful 6th gen console (xbox) therefore the Wii2 will be more powerful than the PS3 or 360. my guess is all games will display in native 1080p
nintendo will not use blu ray discs, and here's why
Sony will not use Blu ray discs - PS1 CD Ps2 DVD PS3 Blu Ray Ps4 Blu Ray isn't quite a pattern
With the exception of this generation, Nintendo has created its own form of game storage every gen.
PS, MS will not use Blu Ray either - HD-Dvd or some variation thereupon, combined with downloadable games