Reclaimer Saga

The Reclaimer Saga, originally the Reclaimer Trilogy, is the ongoing second phase of the Halo video game franchise. The series launched with Halo 4 ' s release on November 6, 2012, and will continue with the release of Halo 5: Guardians in the fall of 2015.

Development
The first installment of the then-trilogy, Halo 4, was announced on June 6th, 2011 with a teaser trailer presented at Microsoft's E3 Media Briefing. The subseries was first identified as the Reclaimer Trilogy during Halo Fest at PAX Prime 2011.

The series marks the Halo games' first foray into the post-Human-Covenant War Halo universe. "Reclaimer" is a title given to humans by the Forerunners, which coincides with humanity's status in the time period the Reclaimer Saga is set. Two novel series, The Forerunner Saga and the Kilo-Five Trilogy, written by Greg Bear and Karen Traviss, respectively, were created as tie-in material to more thoroughly establish the story and themes present in the new game series, particularly the extensive Forerunner elements in the case of the former. Both novel series introduce and build on many characters, technologies and locales encountered in the games. This was not a one-way process, as multiple elements were incorporated into the games after their inclusion in the novels. This is part of 343 Industries' efforts to more seamlessly integrate the Halo games with the other media exploring the Halo universe. The comic series Halo: Escalation was also created to bridge the gap between Halo 4 and its sequel.

On June 21, 2013, Microsoft announced that the Reclaimer Trilogy will be expanded into the Reclaimer Saga, which will not be limited to a trilogy format.

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 trilogy that begins with its release in 2012."

- Official summary

Halo 4 marks the return of John-117 as a playable 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 are adrift aboard the wreckage of the frigate Forward Unto Dawn. They find themselves being drawn into Requiem, a Forerunner Shield World first seen in the Legendary ending of Halo 3.

They confront a remnant faction of the former Covenant Empire as they are pulled into the planet's abyss. Inside Requiem, John is determined to rescue Cortana as she struggles with her own capability and mortality, finally experiencing the effects of rampancy as she nears the end of an AI's seven-year life span. Together they face a new, seemingly unstoppable, foe when they awaken the Ur-Didact, an ancient Forerunner and fallen warrior hero first explored in the Forerunner Saga. After aiding the crew of the upon their arrival, the pair depart from Infinity and set off to battle the Didact and his army of Prometheans to prevent him from obtaining the Composer, a powerful Forerunner device capable of wreaking vengeance and annihilation on the human race.

Halo 5: Guardians
Halo 5: Guardians will be the second game in the Reclaimer Saga. It is set to be released in fall 2015.