Halo messiah Frank O'Connor took to Halo Waypoint to add a little more info regarding Halo 5: Guardians. Specifically he detailed exactly why we're not going to see the next numerical entry into a Halo series until next year.
"We’re not just making a new game in that three year span, we’re also making a new engine," Frankie explained. "During the development of Halo 4, we pushed the Xbox 360 and the engine to its limits, and we were happy with the way we were able to make the Halo universe look. The Xbox 360 still has a few tricks up its sleeve, even now. We are moving to a whole new platform with the Xbox One – a new architecture, new graphics hardware and bluntly some new ways to think about gaming, period."
So it's understandable why Halo 5 will be launching next year, as sad as that news was. On top of having to develop for new hardware, 343 is aiming to create a 60fps experience along with dedicated servers for multiplayer.
Frankie also released a new piece of concept art featuring giant flying sperms.