Thanks for the link, this is the first I'd heard of BF3. BF2 is the last one I played as well. Haven't played it for 2, maybe 3 years, but that's mainly because once I had stopped playing it for a while, there was nigh on a gigabyte of patches to download, and my internet connection was rather slow.
That teaser trailer probably couldn't have been less informative could it, lol. I noticed another video in the 'related' list on the right hand side; a video over 3 minutes long....but it turned out to be an analysis of the teaser trailer! I don't think there was any meaningful info in the trailer to analyse.