Well, I say that there are typically six frontiers to science fiction:
My idea is that there would be a map about what is happening in Rictofen's mind. It was inspired by psyconauts and the line in Pareidolia "they're inside me, i'm inside out". Maybe I'll write down the idea for this map.
If you decide to create that before me, then make sure to give me some credit.
Or maybe Treyarch could just go back to making maps of different buildings and structures instead of trying to break a new frontier every time.
I was thinking maybe they could just do time travel and completely screw up the series, but it would allow Treyarch to make the game take place in historical eras (with modern weapons) so IW won't sue them again.
Or it could go for a turn for the worse. It could completely mess it up like Time Travel did to the Hitchhiker's Guide to the Galaxy series (but that made no sense anyway.)
But story doesn't really matter in a zombie game. Hell, Treyarch could put a speck of semen on a chair and suddenly every conspiracy theorist comes up with a crazy theory about the story.
Maybe I shouldn't say that, since I made the first "explanation for pareidolia" post. But these theories are ridiculous.