That image, and the below animated gifs and more are thanks to Pixel Rally. The gifs show off an explosion moment from in front of Hotel 71 while the other three show Bay giving instructions to Shia LaBeouf and Rosie Huntington-Whiteley who then do two practice runs of tumbling away from an overturned SUV. The full set of pictures can be found at flickr. Thanks to Kel for pointing out the Soundwaves images in the set. The set also includes two videos from filming over the last two weeks. One from is pyrotechnics going off in front of the Michigan Avenue Bridge and the other from the skydiving stunt from two weeks ago.
If interested in reading more, OK Magazine has posted a gallery of images of Josh Duhamel at work while Shia watched. Thanks to John for the link. Also the below video comes from Film Junk and shows yet another angle from the Hotel 71 intersection shoot. Sadly I have no idea what areas Transformers 3 production will be working this weekend but assume in the same general Michigan Avenue area.