I will cringe to see just what JJ Abrams tramples on in his story... Kirk served on the Potemkin as his first assignment. Enterprise NCC1701 Constitution Class first captain was Robert April followed by Christopher Pike (Jeffry Hunter), Not JTK...So a 20 year old Kirk seeing the enterprise being built in the trailer is a conundrum due to pike have commanded for at least ten years prior to Kirk.

Another Trekkie.....

Garbz