Just come back from seeing it at IMAX.
Its... not a Trek film. But I don't say that with any sadness. Trek films to me are sloooooow and for the most part uninteresting. Most of the time they do have some good thought behind them, but much lacking in the action. Even the most action-y one recently, First Contact, felt a bit "pew pew".
This though is the characters we know, but from a different perspective. The growth of characters is there, the humour we get in of the best Trek episodes is there, the OTT and doesnt-quite-fit storyline we know from most Trek is there... but then there's *ACTION*. There are more than a few fist-y-cuff fights, a decent gun battle and many epic spaceship incidents.
I don't watch TV trailers, but Ive read around the net that "this isn't your fathers Star Trek". Many are taking this to mean that its a complete divergence, when infact its exactly the opposite. All the classic Trek "tones" are there, just hyped up, sped up, made bigger, made sexier, made wittier...
There are a couple of parts I don't like. There were a couple of overly tacky parts, a bit like Transformers, in there for the kids (one guy gets sucked through a twisty water pipe) but on the whole these are short, and easily forgivable.
If you know the characters, you'll get a kick out of "their first words". McCoy in particular steals the show with his catchphrases. If you don't know the characters, or even the series, but like Sci-fi, or just a good ACTION movie, you should be much more than pleased with the result.
