A new teaser clip for the upcoming sequel Paranormal Activity 4 has been released.  Plot details were virtually non-existent before the film’s first trailer debuted, and this clip further entices fans of the franchise to start piecing together how this film fits into the series’ mythology.  There are a couple of creepy shots here, but the plot is still rather unclear.  I assume the pic's basic premise will remain a secret until opening night.Hit the jump to check out the trailer.  Directed by Henry Joost and Ariel Schulman, Paranormal Activity 4 opens on October 19th.Click over to Yahoo! to watch in HD.paranormal-activity-4-poster