Paranormal Activity 3 Trailer

So it seems there was enough of us that went to go see Paranormal activity 2 (I'm guilty) that people thought they'd make a third. I myself wasn't crazy about 2 (I thought that it took away from some of the mysteriousness of the first, and as well relied on some of the same gimmicks). But with all the explaining out of the way, maybe we can get back to scary. What will they have to offer when we already know how it all ends? I thought the trailer didn't offer much but remain somewhat hopeful.

This is sounding more and more like one of those "fool me once..." instances. Let's hope not.