The Kidd here...
I've been an unapologetic fan of the PARANORMAL ACTIVITY series since the beginning, and while they haven't been able to match the terror generated by the first film yet, the franchise has still managed to produce solid entries into the haunted house horror sub-genre over the last two films. (I get that the films aren't everyone's thing, so, if they're not your bag, just don't watch them - they're not going to change what they're doing at this point.)
However, if I can lay one big slab of criticism at the series' feet, it'd be to not make promises you don'tintend to keep, namely don't show footage or trailers made up entirely of stuff that is not making the final cut of the movie.
I have no problem with misdirection, or choosing not to give away all your best moments in advance. I'm in favor of that to an extent, but not when it means teasing your potential audience with an entirely different movie altogether. PARANORMAL ACTIVITY 3 had trailers featuring footage that was almost entirely absent from the film, and the real shame in that is I would have liked to see the film in the trailer more than what I eventually got when the film hit theatres. Don't get me wrong... I still dug PA3, but it felt as if there was an even better film lying in the rest of the stuff they shot.
Therefore, take with a grain of salt what you're seeing here with this Yahoo! First Look at PARANORMAL ACTIVITY 4. What we can tell so far is that it appears demon Katie and her kidnapped nephew Hunter have moved next door to some poor unsuspecting family and that bad things are sure to befall them as we learn of some connection they may have with the aforementioned pair in order to keep the franchise going into future installments. I get the feeling Katie doesn't just visit random strangers. I just don't know that you're actually going to see any of this in the finished film.
I do hope they keep the audible alarm warnings though... that's sure to build some tension in theatres come mid-October.