Sideswipe noted that observers thought it seemed like the plan is to have the Autobots communicate with Discovery. The Rotating Service Structure stage for Discovery was delayed to Wednesday night so if plan to film Discovery, that will have to occur on Thursday. Some noting that if the shuttle is a Transformer it should have a female voice since shuttles are traditionally referred to by NASA as "she". Around 3pm EST, he reports that filming moved to the Orbiter Processing Facility (OPF) where the shuttles are prepped for the craft's next scheduled launch with the Endeavour and Atlantis currently being staged.
As for the images provided by Sideswipe (he also posted some on the NASA forums), they seem to show a man in a wheelchair having a meeting with a general or possible NEST members in the VAB. It is unclear on the specifics. I don't think it is a flashback sequence for a rumored 1960's story angle mostly because of the SUVs in the background. Thanks to Sideswipe for the info and pics and Richard for the forum link.