Still, you might care so here's the teaser. It strokes itself (and you) off by saying that it became a hit because the audience demanded it to be. The power is in your hands, this is YOUR franchise! Then we get a glimpse of what's gonna happen in the new one. I don't know what exactly it is since I didn't see the first film, but I'll assume it has something to do with it. Or maybe not, sequels aren't really made with continuity in mind, just dollar signs.
Paranormal Activity 2 comes out October 22, 2010 and there will probably be more to come until the studios realize beating that dead horse isn't going to buy them another platinum sink.