I'm buying this eventually since I lost my CE copy, and I never had it for Xbox, so no co-op for me. I'm glad they're not changing the game at all since the original was great and they're just upgrading the graphics, which just can't go bad, especially since you have a choice to go back for all the bitchy people.
Also, I'm 100% sure if they changed a few things in the actual gameplay besides some Easter eggs and shit, people would've bitched about them changing and giving the whole "if it ain't broken don't fix it" shit, and now that the game's coming out without any changes besides updated graphics, people are bitching saying "it's the same thing!!". I agree that the price is high for a fucking remake, but whatever, I never buy games on release anyways.
Anyways, it would be nice if they remade some classic FPSs with better graphics only like they are doing with CE, with games like: Deus Ex, Red Faction and such, I'd buy them, eventually...