First if you click on the Joker stuck to the wall with a knife, you will discover a new "Dark Knight" movie poster. If you click on the portraits, you will find a countdown clock and the following information:
Gather with 300 of your closest friends at this exact spot on April 28th.
You'll need to be in contact with a partner-in-crime who has online access to relay your instructions once you're there. These instructions will give you the TRAIL to follow, but be sure to look both ways when crossing the street; we wouldn't want you to make an unscheduled visit to the ER now, would we?
Put on a smile and plan to spend about an hour or so bonding with your fellow clowns.
Check back here often for updates or changes.
It is believed a new movie trailer for the upcoming "Dark Knight" movie will be revealed on Monday April 28th.
UPDATE: Turns out each portrait unlocks directions to a movie theater in certain areas that is showing the trailer.