The most interesting part of this is that the Watcher and Knight are basically one entity split off for different roles. Which makes the Spartan Ops sections in which there is just Watchers and no Knights kind of weird. It seems like they could've made that relationship more apparent in the gameplay as well.
Second most interesting thing is seeing the Halo Reach HUD, with Halo 3 weapons, fighting Halo 4 enemies.
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