Quote Originally Posted by ODX View Post
Judging by the look and the weapon reanimation (which was one of the Halo 4 animators), it looked like the 6 remastered MP maps for Halo 2 were in Halo 4's engine, much the same as Ha10's remastered maps were in Reach.

But yeah, everything else will apparently be done on it's own original engine, save for optimization updates for Xbox One. Get excite.
I do believe they said for sure that the six were running in H4's engine.