Alright HaloGAF, I'm back (not that anyone cares...)
Random thoughts:
So, it looks like Cortana is going to go rampant; the comment about AI having a lifespan of 7 years and her freak-out at the end of the trailer pretty much confirm it. She's on the bridge of the Infinity in that last scene so I see no reason why she's not talking to a human.
I'd like to say I pretty much called this happening a while ago, and can easily see Crazy-bitch Cortana as the main villain later in the series once we get past the Didact. Might be interesting to see her flex her muscle and subjugate this ancient evil forerunner so you know you're in for a real fight.
The Hardlight shield looks like it will be easy enough to counter, if that's the replacement for Armor Lock I'm happy.
Forerunner weapons look interesting, the shotgun-like one reminds me of the Flak Cannon from Unreal, the way the red-hot shrapnel ricochets off walls and such. Storm Rifle looks cool but it doesn't sound like an energy weapon. Maybe it's a human weapon adapted from covenant technology or something. Oh well, minor complaint.
Looks good. Damn good. And it looks like Halo, which is more important than you might think.