Update: Now includes official title.
Gears of War Judgment is being made at least in part by Bulletstorm developer People can Fly. Rumors had been rumbling that the developer was at work on something in the Gears franchise, and Epic Games' Mike Capps confirmed the news.
Capps tweeted "YES YES YES!" in response to questions if People Can Fly is involved. This doesn't necessarily mean that the developer is developing it alone, or even taking the lead, but it would certainly make sense if Epic is moving on to other projects after three Gears games. We do know that People Can Fly has been fairly quiet since the release of Bulletstorm, so the team must be up to something. We'll probably know for sure next Monday, during Microsoft's E3 press conference.