Was doing some research after listening to the Bombcast discussion about the lack of certain game modes in the beta, as seen here on Bungie's site, invasion opens this Friday, and "Network Test 1" is next Friday.

generator defense=network test 1. It's the first thing that they played on the "Ask me anything" video.

I'm looking forward to trying Invasion. I got my Xbox late (last September) so never really got into Halo multiplayer. Just played through the single player of 3 and ODST. Enjoying the beta so far, just finding it's getting slightly stale for me wit the lack of maps and all. The lone-wolf play style seems to be prevalent too. I generally prefer objective type games because even if I'm dying a hell of a lot I feel like I'm doing something if I'm preventing flag captures and all. That's why I think I'll enjoy the Invasion and Generator Defense modes more than the modes that are there at the moment.

Honestly, i'm not going to be playing it much, I always burn myself out on multiplayer demo's and beta tests.

Really want to try out some vehicular action, I imagine that there'll be a lot of moaning because of the turret cooldowns though...

Any idea when invasion will be unleashed today?  Kind of bored of the other modes already so looking forward to getting back to oldschool vehicular Halo madness

Maybe later in the morning.