Last night comic book writer Brian Michael Bendis posted an image
that can only be described epic, a piece of concept art by Phil Jimenez depicting a proposed JLA/Transformers crossover! CBR
went on explore the unused concept in a little more detail, the full article can be found here
Just to be clear, this is not happening, it's just conceptual.
“Oh, what an epic that would have been,” Jimenez wrote last night on Twitter, saying to one follower, “You missed out on Wonder Woman’s invisible jet becoming a very cool Transformer.” You can get a peek of that in the image above, along with an enormous Bat-former and, perhaps best of all, Optimus Prime as a Green Lantern. (He added this morning, “Giving credit where credit is due: the idea for Optimus Prime as a GL was none other than [IDW Publishing Editor-in-Chief Chris Ryall's].”