Here is the second part of the beta maps for Gears of War; these will tell you two more of the maps that will be coming in the beta soon:
Trashball:
There is a humongous scoreboard here that you can shoot and knock down; it will damage any nearby enemies or friendlies!
Trenches:
This is a wide open map which is good for sniping; players standing still for too long may find themselves easy prey for the people on higher ground.
http://www.gears3beta.com/gears-of-war-3-beta-maps/
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