transformerslive.blogspot.com have posted some images taken at the Transformers 2 base-camp at The Dairy Fields in Fairmount Park. They also report that "a helicopter that looked similar to Chinese helicopter with front mounted camera used at the Bethlehem shootthe previous week. Shia Labeouf was spotted near the trailers but no other cast members.
In addition, he stumbled across Bumblebee, Optimus Prime, Ironhide, a front damaged 2009 Saturn Vue Hybrid and a new gray concept car being loaded for transport to the Walt
Whitman site. The Hybrid could be for a particular scene or even a
damaged TF but that is just speculation. I believe the concept car is a 2009 Chevy Corvette XR1 that is the alt mode for the Transformer Stinger."