For me, everything that was in CEA, only I want the multiplayer to be halo 2's.
It would be cool to have more firefight maps, too.
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MR RATCHET
Youtube - MR RATCHET - old
Basically a graphical upgrade and live co-op. And IF 343 want, bonus content or "extra" campaign maps, possibly a game version of Halo Uprising but keep it separate from the main campaign so in the "extras" section or something.