This apparently got leaked on YouTube so the official TF site had to release the trailer earlier than expected, watch here: TF movie and also on youtube.
I'm looking forward to seeing it when it's released, although I agree that the trailer doesn't really give anything away! I hope they don't end up deviating from the original storyline of Autobot vs. Decepticon and they keep the key characters like Optimus Prime!
Everything you ever remember the Transformers as go out of the window in this film, it's a whole new TF universe based on present times, the only thing they are keeping close to the G1 series is 2 or 3 of the names and thats it really.
Basically the original story is like this, not sure if they are sticking to it for the movie.
The Autobots (Good guys) and the Decepticons (bad guys) travel the galaxy for new energy sources as their battleling on their home planet Cybertron depleted their sources. The Decepticons spaceship attacks the Autobots ship and they all crash land on Earth into a volcano. When this erupts it activates the computer on the ship which searches Earth for suitable things the transformers can turn into such as cars planes etc it reconfigures all the transformers to have an alternate mode. Both sides then are at war on Earth.
As I said when this spammed (and check the posting history - it IS spam) the Spidey 3 thread, it's not even finished being made yet (ILM are just gone halfway through their workload). Wonder why these berks are pretending they've seen it?