The teaser trailer announced Monday on Late Night with Jimmy Fallon holds many hints into the future of the end of this Gears of War story.
The trailer starts off with a withered, aging Dom bashing through stones shaped like humans in a war-torn field. Dom falls to the ground and is about to get killed by a locust clad in new armor when suddenly the beast is blown away by a double-barreled shotgun held by our hero Marcus, also in new, conservative armor. Then the war starts.
Our heroes Dom, Marcus, Cole, Baird and a new heroine presumed to be Anya are being surrounded by numerous Locust when suddenly a new enemy appears. It has tentacles all over its body and snatches a locust from the fight and flings him far off. This new enemy could be a new species of lambent. or something new we haven't seen before. Another, possibly one or more, larger creatures spawn behind more tentacle monsters and all-out chaos ensues as not only these creatures attack Delta Squad and the Locust, but smaller crawling creatures attack the groups as well.
Get an overview of the trailer at IGN.