No Khan Please.....really, We don't need a Mobius loop of the embittered and psychotic dominant personality coming back and wanting to blow up (fill in the blank).
We had that in The Wrath Of Khan, The Search for Spock, The Undiscovered Country, Insurrection, and Nemesis, Plus Trek 2009.
Enough already.
A retelling of a 'Balance of Terror' Style Episode, perhaps with the new klingons, would be of far more interest.
Give Khan a rest.
A brave little theory, and actually quite coherent for a system of five or seven dimensions -- if only we lived in one.
Academician Prokhor Zakharov, "Now We Are Alone"