This is a little unlike me, but I'm passing on this short video from Gamersyde showing what appears to be footage from the first mission in Reach, with commentary by SketchFactor from Bungie (he's actually playing the mission as a demo for the crowd).

If you want to remain 100% unspoiled, pass on this one, but I can say there's not much in here to worry about. The reason I'm posting it here is so you can hear some of his comments about exploration, and their desire to return to a campaign much more like Halo 1. Besides, it's just pretty darn cool - can't wait.