At this years Xbox E3 press conference Microsoft revealed a trailer and release date for the next Halo game titled, Halo: Combat Evolved Anniversary.
This is a remake of the first Halo game released on Xbox back in 2001. The game is running on the Halo: Reach engine but plays like Halo 1 (physics and gameplay.) 343 has revealed that you will be able to press a button anytime during gameplay and it will switch between Halo 1 and Halo HD graphics (kinda like Monkey Island on XBLA.)
Halo HD releases November 15, 2011. Check out the SICK new graphics for Halo in the below trailer!