I'm actually afraid of this, cause propably the backcompat Halos are going to be the exact same Halos that would be with original resolution (maybe) and framerate 30fps. Also the 360 emulator on xbox one can cause some input lag like we saw with black ops 2. So I'm afraid this is going to be a sluggish come back of original Halos (I really hope devs can prove me wrong). What I would have liked to see instead was Halo 3 Anniversary with dedicated servers or just fixing the MCC matchmaking system.
Ps. 343 it's still not too late! Halo 3 Anniversary with proper matchmaking would be massive for Halo community while we are waiting for Halo 6!