Thankfully, I snagged ncsuDuncan before my little brother went to college.
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I don't want a straight port/remake of Halo 2 like CEA. Would they keep all of the glitches? Or pick and choose? No matter what you choose, the game wouldn't play exactly like the old version (or how I remember the old version, at least).
I wouldn't be averse to a retelling of Halo 2's story though. Give me a remake of the campaign with the latest Halo engine, full online co-op and everything. Add in gameplay elements that pay homage to the original, but by all means don't worry about being pixel perfect like CEA.
And give us the Forerunner Ship ending that bridges it with Halo 3.