The first is a message from Jason, who provided many set pictures and set reports while Transformers was shooting at Bethlehem Steel over the summer. On the last day of the shoot, he was invited to watch the last scene shot at the site, which is now in the trailer at the 1:02 point. It is the moment when the Scavenger completes his transformation and smashes his arms into the ground setting off a huge explosion. Jason also grabbed the screenshot to the left that shows a face in the debris (1:06 point) that the blow causes. Any clue what that is? Maybe ILM having some fun? My best guess is the site is supposed to be Shanghai, China so its a CGI statue head I guess that might be in the area.
Over at Planet Lynx there are some screenshot that help get a good look at the apparently unicycle style of the Arcee units, a breakdown where apparently Audi doesn't just flip and transform, but flips, shoots at them and then transforms (showing level of detail ILM is putting on screen), the shot to the right that indicates that Scorponok is diving on the geriatric Jetfire and a possible look at the Fallen. Update: The cane pic has been updated from an image from Carl to illustrate that the cane is landing gear.
Update 2: Below are some screenshots provided by Elis. The first gives you a look at what is probably The Fallen in the desert, a freeze of Scavenger transforming with the cab on his shoulder, the bug that is torn by Sam complete with mini satellite dish (possible Soundwave minion?), and last is a shot of the unicycle look of Arcee.