Are you joking Nintendo?

[A Black Falcon]

B.) It's using the Metroid Prime 3 engine for all games, which traded some of its subtle visual effects (warping) and some major ones (real time water) for more on screen sheninanigans, enemies, etc. as well as more instances of real time lighting, bump mapping and a myriad of other niceties including bloom lighting (all of which are now in all 3 games).

Given that the Wii is more powerful, they really shouldn't have had to "trade" anything. Wii games should not look worse than Gamecube ones! There's no good reason for it!

... As for the censorship, evidently it's a few mild curse words somewhere in some of the text files you can read in the game. Not really a big deal I think, but kind of odd that it was allowed before but not this time.