Reclaimer Saga

Were you looking for the Halo trilogy, the original Halo trilogy that started with Halo: Combat Evolved?

The Reclaimer Saga  is the saga following Halo 3. The Saga began with Halo 4, released on November 6, 2012, which was followed by Halo: Spartan Assault and will continue with at least Halo (Xbox One), Halo 5 and Halo 6.

Halo 4
"Set in the aftermath of Halo 3, Master Chief returns to confront his own destiny and face an ancient evil that threatens the fate of the entire universe. Halo 4 marks the start of a new saga that begins with its release in 2012."

- Official summary

Halo 4 marks the return of John-117 as the protagonist after three Halo games focusing on different sets of characters. Having been lost in space in the finale of Halo 3, John-117 and Cortana, adrift aboard the wreckage of the frigate, find themselves near Requiem, the planet first seen in the Legendary ending of Halo 3.

Halo (Xbox One)
Halo (Xbox One) is an upcoming Halo game, which will be released in 2014 for the Xbox One. Little else is currently known about the game, but 343 Industries states that "it will be a darker title" in the Reclaimer Saga.

Halo 5
Halo 5 is an upcoming Halo game, one of the four new games announced at E3 2011 along with Halo: CEA, Halo 4, and Halo 6. Nothing is known about the game besides it being the penultimate chapter in the Reclaimer Saga.

Halo 6
Halo 6 is an upcoming Halo game, one of the four new games announced at E3 2011 along with Halo: CEA, Halo 4, and Halo 5. Nothing is known about the game besides it being the final chapter in the Reclaimer Saga.

Trivia

 * The Reclaimer Saga is the first set of games to introduce the Prometheans, non-biological artificial intelligence made by the Forerunners.
 * According to Microsoft Studios' Phil Spencer, "The upcoming Halo game Halo (Xbox One) is a genuine entry in the sci-fi franchise; the series is no longer a trilogy, but now a saga."
 * The Halo 4 Limited Edition says "The Reclaimer Saga Begins" on the back of the sleeve.