If everything goes as planned, they will be blowing up the old Brach Candy factory today. Over the past few days production crews have transformed the front of the building to look like Gotham General Hospital.
HollywoodChicago.com has received different reports on the scale of the stunt. Either they plan to implode the entire building or they will just be blowing out the front of the building. Either way, with the recent open casting call seeking amputee extras to portray hospital patients, this has the markings of a spectacular stunt for the new movie. Looks like director Christopher Nolan is using every last penny of his expanded budget for The Dark Knight
I also found a slew of photos from this past weekend's filming of a memorial service that will take place during the movie. Lots of shots of Gotham police officers, vehicles, etc. all lined up formally and marching down LaSalle street in downtown Chicago. There are some good photos of Christohper Nolan discussing scenes with the crew, and plenty of photos of Gary Oldman as Lt. Jim Gordon. Also a few shots of Anthony Michael Hall (who plays a television news reporter) and Aaron Eckhart (Harvey Dent).
Update: the local FOX affiliate is practically giving us a live video feed of the Gotham General Hospital explosion.