Halo on Xbox One is a full-fledged entry in the first-person shooter series, but Microsoft won't say whether it's Halo 5. Microsoft confirmed to GameSpot that the new game, which was first teased at E3, is part of the Reclaimers saga.

That's right, it's now the Reclaimer saga, not trilogy.

Halo 4 was originally billed as the start of another self-contained trio, much like how Halo: Combat Evolved kicked off the first set of three. Turns out that was a bit too restrictive for the next phase of Xbox's signature space marine adventures.

"While we originally said trilogy, we've actually expanded this to more of a saga, so we don't want to limit the Reclaimer story within a trilogy," a Microsoft representative said.

Microsoft Game Studios VP Phil Spencer told GameSpot that we'll learn more about how it ties into the newly expanded narrative soon.

"It is the next Halo game that we are working on," Spencer said. "We will talk more about actually the story arc in the game and how it plays out; we've got more time to talk about that."