One of the kind members of the unnamed team that breaks down GTTV trailers, here's a breakdown of Bungie's new Halo: Reach demo footage.
http://gruntsrus.com/2010/04/tied-the-leader-analysis-of-gttv-footage/
Mainly interesting thing is the "Capture the Core" objective part of Invasion. It'll definitely seem familiar when you see it.
EDIT: More info on armor and the new Credit system here
http://gruntsrus.com/2010/04/halo-reach-multiplayer-beta-vidoc-carnage-carnivale/

This game looks so ****ing sweet.

My favorite part is the Loadout and Fire-Team spawn system. I mean, choosing where you want to spawn? That alone makes me want to buy it.

Well, playing the new Invasion types might eliminate total retards that you usually play with when you play Halo, and I like that.

Holy shit its GRU. I wonder if Oreo is still running the joint. Anyway the beta is going to be lots of fun I think :D

I'd bet $50 that the common nickname for fire team will be in the ballpark of butt buddies or something like that.