Nice post, CK.
How long have we been saying this? Since the release of Halo 2, when everybody bitched and moaned how it wasn't the EXACT same as Halo.
For me personally, I will read everything I can find about the game. I'll participate in any beta testing I can, download everything available. Mainly because I like being the guy about whom people say, "Ask him, because he knows!"
I won't be disappointed with Halo 3 ( I don't think), because my expectations are fairly low. I don't have PS3 style hype built-up in my head. I expect it to be different. I don't expect it to be world shattering.
I think what will be the key is, once again, it's utilization of Xbox Live. Halo 2 broke new ground with it's matchmaking greatness, parties, etc. If Halo 3 just follows that up with new weapons, maps, gameplay, tactics, and a few key additions (FULL OPPOSING TEAM ONE-BUTTON MUTE FEATURE!!!), I'll be OK.