Microsoft teased E3 attendees earlier this summer when a reveal trailer for Halo 4 debuted at the company's annual convention press conference. The brief video confirmed almost nothing about the game, other than the return of Master Chief and Cortana. A little more emerged over the weekend, with 343 Industries revealing at PAX that Halo 4 kicks of "The Reclaimer Trilogy."
343's Frank O'Connor confirmed that the fourth Halo game and the two that follow it will continue the story of Master Chief and Cortana, who were last seen in Halo 3. He didn't say anything about what the title "The Reclaimer Trilogy" points to, though he did confirm that we'll get to know John-117, the man inside Master Chief's armor, a little better.
Halophiles probably know what a Reclaimer is already, but the Halo Nation wiki lays it out for those who don't. In short, a Reclaimer -- which can only be either a human or a Forerunner -- is one who is tasked with activating and operating Forerunner technology, including the Halo weapons.
To get a sense of the direction 343's efforts are taking, check out the concept art video gallery in the embed up top.
Source: Game Informer