From watching the trailer only, what is the movie about? What's the general plot?
I have no idea. There's people jumping, people fighting, and someone riding a petrol-powered motorbike in the future. I assume there's a reason why they are doing all these things in the trailer, but then again, that's just an assumption. The music and non-stop action sequences in the trailer makes the movie look loud and dumb.
Unless later trailers do a better job of describing the movie, I don't see why anybody would pay up to see it at the cinema. Trekkies already hate it and non-Trekkies don't know what it's about. They'd probably rather see the next superhero movie starring characters they already know, or the next remake of a classic movie where they already know what's going on.
Admittedly, Star Wars also keeps tight-lipped on its plot, but Episode VII sells itself, and the latest trailers give the impression of a decent story.