If you take a look at the front of the nacelles, they look like Transwarp nacelles.
I am going to go on a limb and say this is JJ's Excelsior
Knowing JJ's version of Kirk being played recklessly by Pine, I can hear Pike saying:
You splashed down not one, but two new starships, Kirk?
Frankly, I think we see Khan in the next film, with a reveal at the end--something to hook the audience as was done with Empire strikes back or Nick Fury at the end of the Marvel movies leading up to Avengers.
That seems to be the direction things are heading in by the feel of things