Titanfall is the new game from the creators of Call of Duty. It is a Onlineshooter on the base of the Source-Engine.
On the E3 there was a first trailer:
Sadly it seems like there will be no single player campaign. The game looks quite interesting to me. I was not a fan of the "Call of Duty" games, but Titanfall looks promising. You can switch from a soldier to a Titan(Mech) and have so much more tactical options. They showed parts of it in the Gameplay Video:
The game shall be released in fall 2013 for Xbox One and Xbox 360. A PC Version is planned for beginning 2014.