For those that haven't seen it yet, here is the full panel of WW84.
There was footage shown, but it is literally just a rough cut of a scene. Collider (as I'm sure others) have a description of what was shown). Given it was really, REALLY early footage, it really wasn't much.
There was some, hmm, confusing, insight into what this movie will be. Is it a sequal? Is it just a new movie featuring Wonder Woman? Does it connect to the DCEU? (note Patty Jenkins and Gal Gadot's response to that question).