The cover is very evocative of the Abrams films (in case CBS' attempt to cash in on them wasn't obvious by the episode choices). I'm a little surprised this is coming out in September, though, and not to coincide with the release date of the movie (or its home video release, unless that's already been announced?).
I would imagine CBS is trying to time the release to not directly step on the toes (and/or get lost in the shadow) of Paramount's home video release of STID, (which is rumored to be the next month, October). It also happens to be fit with CBS's own releases, where TNG S4 comes out this month, and ENT S2 comes out in Aug.