Is it true that Theater isn’t available in Campaign and Opartan ops? If so, what was the reasoning behind this and will there be a future patch or download to fix this? - unip8
Theater Mode in Campaign did not make the cut for launch for various reasons of scheduling, rendering issues and some significant engine changes. However, we are treating Title Updates very differently for Halo 4 and rather than simply using them as opportunities for simple big fixes, we are thinking of them as a way to sustain and grow features and options, so it is possible you could see Saved Films made available for Campaign (as well as some other significant features) at some time in the not-too-distant future, but that’s yet to be determined.
From Q and A in Bulletin from 11.1.12 Bulletin