Cliff Bleszinski was scheduled to make an announcement on Jimmy Fallon last night but was bumped due to scheduling conflict. He will however be on Monday night to make that announcement.
Since it's been a couple of years many people have talked about Gears of War 3 coming out this year. However I'm not so sure that Jimmy Fallon's show is the place you would want to make that kind of announcement. I guess we will have to wait and see.