Now, if you haven't beaten Halo 4 yet, there may be some spoilers here. So stop reading. OK?
As we learn in Halo 4, the Forerunners and Humans already made contact millenna ago and a war broke out. The Forerunners put us essentially back into the Stone Age. Now here's my question; is this something Bungie had already established in the Halo universe or is this something 343 added? I'm really sorry if this is a silly question, I don't know as much about Halo's overall storyline as I'd like to.
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It was first revealed that ancient man had an empire in Cryptum, not H4. Read it for some more background and exposition on the Forerunners. It was 343i's idea to add the ancient human empire. [Edited on 12.04.2012 12:50 PM PST]