I will admit to only having seen the first in this series. I feel like Paranormal Activity is the new Saw series, one comes out each October around Halloween. To add I’ve been fairly straightforward that horror series aren’t my favorite as most have the same cliches and plot lines. There is a teaser out for the latest in the series.
On a side note, The Cabin in the Woods comes out on dvd and blu-ray on September 18th, just in time for your Octobery horror fix.
They are promising a full trailer on August 1st.