What would I like to see?
An ending that isn't so ******, for one. I about threw my TV out the window when Halo 2 ended.
NO MORE PLAYING AS THE COVENANT. For Christ's sake. Take it out. No one wanted to play as them, especially not for over half the damn game.
FIGHTING ON EARTH. That's right, like we were promised for Halo 2. Not "one level on earth is good enough," we want the whole game in urban combat settings Bungie!
Patches against modders. That's right. Bungie needs to accept that they're lazy and suck and need to prevent modders from online games.