Defiance is an MMO shooter developed by Trion Worlds, the same guys who brought us RIFT. A TV show of the same name accompanies the game and the events of the show will affect the game, and vice versa.
The game is a third person shooter within an open world. A lot more information can be found at the link below, and even more can be found by simply browsing the website.
CURRENTLY $9.99 ON STEAM