I got this update from our comments section. Thanks for all the info!
My neighbor went to the Cheyney Post Office on Station Road Friday to get
her mail, and they were filming The Happening there. She said there were 4
railroad cars and lots of extras walking in front of the trains talking on cell
phones. She was standing next to a man who said his son was an extra in the
movie. He pointed out M. Knight Shyamalan to her, and said something about Mark
Wahlberg, but my neighbor hadn't heard of him and didn't remember what he said.
We don't know if Mark was filming there. The Cheyney sign had been taken down
and there was a sign that said Filbert. They've moved on--all that's left are
some giant lights. I don't think they were ever filming at the Cheyney
University parking lot, the buses and trailers were just parked there.