: Sorry to barge in on the beta talk when I'm not testing, but: old
: fanon/speculation is one of my many lifebloods and I must know more. If
: you're willing to share, that is.
Well all the leaked info I remember is basically in the plot of Eternal now, though I had to add some extra to fill in the gaps that I didn't know. But in an old, pre-Microsoft version of the Halo story, Master Chief was the player-character from Marathon, the Covenant were the remainder of the Pfhor empire after its sacking by the combined Human and S'pht'Kr fleets, the Forerunners were the Jjaro and, as in Eternal, they were human (though the exact mechanism of how a human spacefaring civilization existed prior to when we think human life evolved on Earth was not revealed to me, so the time-travel part of that plot point was made up by me for Eternal). The rest of the details of Forerunner/Jjaro history and the plot of the game were, as far as I'm aware / can recall, the same, as was the nature of the Covenant/Pfhor having stolen most of their technology from the Forerunners/Jjaro.
The events of Eternal chapter 5 were originally supposed to be the events of the first firing of Halo, and the time-travel plot there was my explanation for why 343GS thinks he recognizes Master Chief personally, and thinks he's already fired Halo before, aeons ago: they've met, and he has.