Waluigi said:
I'm hoping that after you finish the game with 120 stars, that you get to play all SM64 Levels on galaxy.
Sort of like a remake.
It's very, very, very, very, extremely unlikely that they would do that. Besides, most of Super Mario 64's levels just wouldn't work as a Galaxy level. Whomp's Fortress was most likely chosen because it's one of the most remembered levels from the game, and it fits well in Galaxy because it's floating in the sky. Plus, this is Super Mario Galaxy 2, not Super Mario 64 Galaxy.
Anyway, I accidentally read a spoiler (that may or may not be true) that revealed what you
do unlock once you collect 120 Stars...and, although I won't repeat it, rest assured, it's something spectacular.