So, here's an interesting idea: take three movies that take place in the same timeline, but were released out of order, and re-edit them together in a chronological format. It's been done before (I remember that The Godfather and The Godfather Part II got that treatment at some point), but I'm not sure precisely how well it'll work in Paranormal Activity: The Chronology, a re-cut version of the Paranormal Activity trilogy that will apparently set PA3 at the beginning, then cut to the bulk of PA2, then show most of Paranormal Activity before heading back to PA2? (Correct me if I'm off on my timeline here.)
I confess that I'm not entirely sure I see the point behind an exercise like this (although the iTunes page promises "never-before-seen footage"). I am actively pro-Paranormal Activity, but even I have better things to do than to sit down for five hours of creepy noises and jump scares. Still, if you know a sensitive soul who's avoided the films before now, this might be a good thing to lock them in the room with, if you don't mind spending 25 bucks. Currently it looks like this is only available on iTunes, and there's no rental option; only a purchase price.