I think it might have something more to do do with Cogman being a Headmaster. Or it's something completely different, like
or it's something that is stupidly never explained. This could either be really awesome or really dumb, and I'm worried it'll be really dumb.
Looking at it for like the fortieth time, I think it's something that Cade whipped up as a distraction. Bumblebee can split himself into parts to make the bad guys think he's dead, and then surprise them and kick their skidplates. When Bee's head rolls up, his eyes aren't dark like every other dead Transformer we've seen. Now, it may have been cut for the trailer, and so we don't see the eyes go out before whatever happens happens, which meanss he's alive. I think this may just be a new skill Bee has picked up thanks to Cade's tinkering.