That A330 does a PHL-MCO-PHL turn, arriving back in PHL around 4:30pm, where it will then go across the pond. Today the plane is operating the PHL-MUC flight.
If anything, AA might cancel the PHL-MCO flight for fear of the return flight not being able to make it back to PHL. They will at least try to get most of the Europe bank off.
Of course, this is just mindless speculation on my part, which is all anyone around here will be able to do until the gravity of the storm is better known. If it's bad enough then everything will get cancelled...if your meeting is critical, I would do whatever I could to try and get out on Monday.