Possible spoilers

http://gamenyusu.com/component/content/article/2-xbox-news/1026-gears-of-war-3-sandbar-map-gameplay-.html

Won't let me watch the videos :-/

How come? Are you using NoScript or some other ad blocker?

It's working now. Before I would push play but the screen would just turn black.

EDIT: I really like what I see! It's really cool how you can see the map layout before the match starts. Also, all of the maps look really well done. Question, what are those green boxes on the map? Unfinished cover?

Pretty sure they're traps, turrets and other things you can activate with kill points or whatever.

Hmm..the first video shows him as a locust in the character setup, but he's human in the actual game. Seems fishy.

I couldn't watch very long. I want the game to be a complete discovery, and I don't want to know anything about it beforehand.

Might be a game mode where you play a round as each faction. Before the game would load in, he'd check the players screen. I assume he did that, to see which side he'd be on.