Oh please. They're letting it evolve with the rest of the game industry. Halo's fallen behind other games, and the progressive style games have been eating away from Halo since COD4. Everyone who's played H4 says the gameplay is the best out of the series, or at least on par with H1. The MP is going to be different for sure, but it's not like any of the other Halo games respected their predecessors MP either.

On another note, that trailer pumps me up for SPOPS. The pre rendered cutscenes look amazing, based on suiting up scenes we were shown, I'm inclined to think that they stream you a video based on what your player profiles armor is set to, hence why you can only do SPOPS with a connection to XBL.