Well, I cannot vouch for this myself but apparently the HHN commercial has been seen. It was described in an email as follows:
"The Horror Nights commercial is a UO security guard who walks into a
warehouse. The lantern is shown engulfed in flames and then a black
smokey matter attacks the guard. Logo then a flashlight flickering on
the floor. Its being shown in the previews for The Last Exorcism. "
This lines up with what has been sent in earlier this year about the commercial being filmed at a warehouse in Sanford, FL by the Spierig brothers. Hopefully video will follow (just not wise to film ANYTHING in a theater.)