Paranormal Activity
The duo were credited as co-writers on Paranormal Activity 2, which saw the world's most passive aggressive demon moving his act from terrorizing couples to whole families. Actually the film was a prequel, and an effective one in that it clarified a lot of questions I had after the first flick. I'm going to assume that this third installment will do much the same thing.
Oren Peli, who created the Paranormal Activity concept and directed the first movie, will remain on board as producer and will likely assist in the scripting as well. No word yet on who'll be directing, but popular opininon seems to be that Tod Williams will be returning. Look for Paranormal Activity 3 to hit theaters on October 21st 2011.
Thanks to BloodyDisgusting for the info!