The first is the one released for the US market and the second was released for Japanese audiences. While they share a majority of footage, the Japanese trailer is a few seconds longer thanks to one shot that strongly recalls an iconic image from the classic Star Trek II: The Wrath Of Khan. Is this a spoiler for whatever story Abrams still has under wraps? Probably not. I am guessing this is Abrams doing something he knows will whip fans up into a frenzy.
As to speculation as to what the film’s actual story will be, I know that there is a segment of fandom who are convinced that franchise incoming actor Benedict Cumberbatch will be playing Gary Mitchell, a friend of Jim Kirk’s who gains tremendous telepathic powers only to be slowly driven insane by them. The character was introduced in the classic Trek series episode “Where No Man Has Gone Before.” However, this episode was already retold in the first two issues of the IDW ongoing Star Trek comic that has been carefully monitored by Paramount to ensure that it does nothing that will contradict what will happen in the films.
Given that one extra shot in the Japanese trailer and some of the things we see Cumberbatch’s character do in both trailers, I suppose there is evidence that the film may do some version of Star Trek II‘s titular villain Khan Noonan Singh. I’m still not sold on the idea that this would be the best way to go, though. With a whole new galaxy-wide playground on which to play, going back to rehash some classic Trek storylines strikes me as a lazy option.
Star Trek Into Darkness opens next summer.