Do you think there would ever be mentions or signs of the ancient human civilization in halo 4, or the other 2 games of this new trilogy?
It would be interesting to see more ruins of their civilizations, we already got a taste of this in the babysitter [url]http://www.halopedia.org/The_Babysitter[/url]
Maybe some of the ancient humans of some prehistoric human colony survived the forerunner-human war (we could then see there descendents).
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Requiem is a Forerunner world/construct. There will be no human structures there, unless the Forerunner brought some there as spoils of war. Other than references, don't expect anything else.