[url=http://www.ign.com/articles/2013/06/21/halo-reclaimer-trilogy-expanded-to-saga]Link[/url] [quote]While Halo 4 was originally meant to kick off the "Reclaimer Trilogy" for the series, Microsoft's Phil Spencer says it won't be limited to a trilogy.
"While we originally said trilogy, we've actually expanded this to more of a saga," Spencer told GameSpot, "so we don't want to limit the Reclaimer story within a trilogy." Spencer declined to specify whether the Xbox One Halo title was Halo 5 proper or a spinoff of sorts, opting instead to say that it's "a legitimate version of Halo" Microsoft will detail in the future.[/quote] So There was supposed to only be Halo 4,5, and 6, but now that trilogy is apparently going to be a saga, which is 6 games.
Microsoft sure loves their milk.
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They need more space to cover the stuff that was told in Silentium. Halo 4 was barely enough to fit in the Didact, the concept of Ancient Humanity and the Mantle, so I don't see it being feasible for them to tell their overarching story in just 2 FPS games. It may also allow them to flesh out the setting a bit better, like what Halo 2 did after Combat Evolved - Halo 4 really didn't hint towards much of anything in the contemporary fictional setting, like what the UNSC is like and how it is faring, who these new Covenant are and why they exist and are hostile, or where the Arbiter and the rest of the benign Elites and Covenant are (If they even still exist). These things not being explained all caused problems on their own.