Halo franchise director and 343 Intustries' boss Frank O' Conner has said Halo 4 won't be coming to Microsoft and reaffirmed that the title is strictly for the Xbox 360.
The studio's decision not to talk about Halo 4's engine at E3 along with the snowballing speculation that Microsoft is on the cusp of announcing its next-generation hardware has led forumites to speculate Halo 4 will be a part of the next Xbox's debut.
O' Conner responded to the speculation on NeoGAF, saying the next chapter in Microsoft's flagship shooter franchise will only see release on Xbox 360.
"Halo 4 will be on Xbox 360 and use a modified core of the Halo engine(s). Not really a singular engine since it goes through fairly radical evolutions all the time," he posted.