Halo franchise director Frank O'Connor confirmed that Halo 4, the start of the series' next trilogy, will release on the Xbox 360, squashing the speculation of it releasing on next-generation hardware.
"Halo 4 will be on Xbox 360 and use a modified core of the Halo engine(s)," O'Connor posted on NeoGAF. "Not really a singular engine since it goes through fairly radical evolutions all the time."
Speculation of Halo 4 launching on a new Xbox began when the teaser trailer was shown at E3, and 343 hadn't mentioned the game's engine.