I don't wanna be a jerk but seriously just because Halo CE has one doesn't mean that all a sudden Halo 2 will have one. I liked Halo 2, in fact I loved it but I just don't think it should make people this desperate over a game. All I'm saying is most likely Halo 2 won't have a remake.
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CEA was a great idea. Upgrade the graphics to try to draw in the "Released in the last 2 seconds" crowd, while fan servicing the die hards. I'm not sure it worked for the aforementioned, but, as an original Xboxer, was thrilled to see the achievement challenges. Actually added new playing time to a game I (thought I) knew every inch of years ago. If only to "prove" my 2 chops, would absolutely embrace anything new and 2. Yes, there were minute tweaks, but similar tweaks for 2 would be bearable. (Or at least an on/off switch for armor abilities, etc.)