LaSalle Street Bridge is the location of the Transformers 3 ending lip lock between Sam and Carly but it also seems to be the location of some action too as the new gallery of images from Pixel Rally show. The images show at least the appearance of Bumblebee and Megatron in robot modes along with the usual street destruction dressing. It also shows a little bit of Shia LaBeouf, Rosie Huntington-Whiteley, Michael Bay and crew as they prepare. Below are a few images from the 51 picture gallery which can be found here.
Also possible spoiler warning. Thanks to borrissey who spoke with a PA who verified that the lip lock is the last scene of the film and that Megatron dies, "this time it's final." Take from that what you will but it does seem this movie will have a hefty Transformers body count.