At its pre-E3 press conference last year, Microsoft promised that "in 2014, combat will truly evolve" with a Halo game on the Xbox One hardware. While there will be some as yet unannounced Halo content coming to the console this year, Microsoft has now announced that the proper sequel Halo 5: Guardians won't be available until the fall of 2015.

At a briefing event before next month's E3 presentation, Microsoft and the Halo developers at 343 Studios said that "Halo 5, to be the game we need it to be, needs a three-year development cycle." That puts it on a similar development track to previous Halo games, the developers said, even though the transition to new console hardware makes work on the game somewhat harder.

"Any time you go to a new platform, it's a chance to take a step back for a broader perspective, like a blank canvas," 343 General Manager Bonnie Ross told the assembled press. "The question is, 'How do we tell new stories? Where do we start, where do we go on Xbox One?'"

Noting the momentous loss at the end of Halo 4 (left vague here just in case it's a spoiler for anyone), Ross said that in Halo 5 Master Chief will be "questioning his past, his purpose, what he's fighting for, why he's fighting. On Xbox One, we want to be very deliberate with the story we told with Chief. It's about his journey, his past, and his future."

343 Franchise Development Director Frank O'Connor said that every past Halo game has brought some major new features to console first-person shooters, and that Halo 5 similarly would be about more than just adding a new chapter or content on top of Halo 4. He also talked up the team's efforts to start again from scratch for the technology behind the new game.

"With Halo 4, we went back to the drawing board, but was really an iteration of an existing engine. [Halo 5] will be a new engine on new architecture, benefitting everything from audio to graphics rendering."

The developers weren't ready to share any footage or additional details about Halo 5 just yet, but said that they'll be talking more about the game toward the end of this year and early next year.