I personally do not believe there is anything in those comments which means anything significant. But let's play with this for a moment, shall we? If Darkness is indeed Quinto's last movie, what does this mean for Spock? Surely they would not recast him again so soon, so this could likely mean that Spock could die in the movie. Abrams and his cohorts really want to mimic TWOK, don't they? Also, this narrows things down and makes it pretty damn obvious that Cumberbatch must be playing Khan.