This is the only thing we need to know, aside from the history of Maxis and Richtofen's rivalry.
I feel that it is very safe to assume that the buried force is referring to element 115, as I doubt they actually knew the zombies in the tomb were actually there. They planned to utilize element 115 for energy, but in different forms. Richtofen wanted to use it to create the Ultimate Human Soldier. This is what he was doing in the intro scene when he was first introduced. He was testing the effects of 115 on a body. I'm sure of it.
Maxis, however, used a different approach. Maxis wanted to create a super soldier, but he created a MECHANICAL one. An iron giant, if you would. This is the robot that we see in the cinematic.
Throughout the story of Black Ops 2, while not IMMEDIATELY revealing any evidence about an actual plot, did give us a major hint about Origins throughout the maps, minus MoTD. They hinted at a struggle between Life and Machine, between Richtofen and Maxis. Whether it was killing zombies to power a spire (Life), or collecting the energy of Him (Machine), flinging zombies into a radio tower, or bouncing metal balls from trample steams, or even the different methods of collecting the wisps in Buried. Maxis even talks with us through electronics, while Richtofen just speaks normally!
The hint has always been there.
That's essentially all I have for this thread. Thanks for reading, and maybe I'll be back with a crazy theory. Maybe.
UPDATE: I'm currently working on a concept that essentially wraps up all the games, essentially ending the story. The concept that I'm working out right now is that it is actually that either Richtofen sent himself back, or Maxis sent him back so that way they can guide younger Richtofen in what to do? The voices in Richtofen's head? It's been Richtofen. It's always been Richtofen. But it's been a Richtofen that knows what he's doing. Essentially, Richtofen/Maxis sent him back in time, into younger Richtofen's body so that way NONE of the story ever happens. Maxis keeps his daughter, Richtofen has his body, and the zombie infestation is done. Over.
The only reason I'm considering this as even remotely possible is that Treyarch is very heavily hinting that this isn't just the beginning, but it's also the end.
This explains how he knows how to stop or try to stop maxis. Such as how he knew about the golden rod, shangra la ect ect. Just pointing it out that maybe this isnt the first time this has happen to poor edward. Maybe he wasnt always insane and all the time traveling has gone to his brain? Quick restart the xbox and lets play again tehehehahahaha spleeeens