If you've seen the Nintendo E3 coverage, you'll already know this:

MARIO GALAXY HAS A SEQUEL!!!!!!!!

Link:

http://www.youtube.com/watch?v=o9pWgEp86cM

Yeah, I know, not the most creative name... :P

Looks fun. You know, for those people who mastered Galaxy 1, this should be a challenge.

And... Yoshi's in it...

WOOT! This should be fun...