DICE and EA have released a video that shows off plenty of gameplay footage from a demo of Battlefield 3. Of course the footage is from a pre-alpha build of the game so you can take everything that you are seeing with a grain of salt but it definitely looks impressive already. It is worth noting that if you want to watch the whole thing you should make yourself nice and comfortable as the video is twelve minutes long.
The video shows off a level that they are currently calling Fault Line and there is also a little bit of random footage thrown in at the end to help keep fans of the Battlefield series hyped up for the title. Unfortunately there currently is no release date other than some point in Fall of 2011 but at least it is slated for releasing this year.