We already know that the film will feature time travel, Orci said it somewhere. We know that it features old Spock. We know that some of the things will look different(Technology) and we know there will be a canonical reason for it.
I think that Spock goes back in time and affects it, maybe just temporarily, thus explaining all of the above and it gives us a new TOS era adventure!
I like the idea of it starting up with Riker and the Titan and it ending with the Enterprise E(but I doubt it will end on the E)
"He's Dead Jim, Dead Jim, Dead Jim, Dead!"