Some interesting ideas, can't say I think anyone has hit the mark though, here's obviously what's really going to happen:
Cumberbatch is Gary Mitchel, Weller will be an officer around him and be a sidekick or right hand man sort of character. The story will revolve around Mitchell going a bit crazy and doing something which makes Starfleet send Kirk after him, being a close friend and all. This will give Kirk some good character interaction with Mitchell and for this time Spock will be the logical one reining Kirk in rather than the emotional Vulcan he was in the last film. Anyone think there's any chance any of that is right?
And yeah... no more time travel!