Do you know the area?
The report of buses (from the Chicago area) going from one polling place to another has been reported for years. It is one of the reasons that Todd Ricotta/State GOP machine worked so hard to get voter ID passed.
Rumor has been spreading all summer that cameras were going to be out in full force. Expect more of the same before something is done.
Ping Earthdweller cause I think he may know more facts, while my post is mostly rumor.