Is it real? Nobody knows. While it is hard to imagine this being legit, it definitely represents a problem to the developers. We're surprised the feed didn't get the smackdown immediately, but trying to rollout a significant next-gen title might occupy most of your free time.
If people could just be patient, this game will be in your hot little hands very soon. So stop wasting your time downloading useless binaries, and just stare at a calendar. Or you could go to a preview of Texas Chainsaw Massacre: The Beginning, and get hands on with Gears afterwards.
[Update, took out the link ... we're definitely not encouraging piracy here, folks.]