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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Given how 343 remade H:CE, that is to say they only updated the graphics and left the engine, H2 would be a great candidate for that. I do miss H2's multiplayer, and if a remake can bring it back, there's nothing quite wrong with it. It might not be as expansive as recent games, but an HD remake is anything but bad news.