Honestly, I don't think there's anything else they would make a trailer for other than new worlds. There could be an original world feature but other than a few cutscenes and battle scenes in the places we've already seen, they don't seem interested in giving us too much more. Look at what we saw from the Japanese event where Sora's VA played Arendelle and Toy Box, even that video was chopped up for the sake of keeping things on the DL and they skipped the cutscenes.
To add, look at the Pooh trailer. That got people talking and hyped and they barely showed much of Pooh's world. They could easily just shove in 1-2 Disney worlds in the trailer, quickly show a cutscene in each, snippets of gameplay in them and be done with their reveals. ANd then release the renders and voice cast announcement the week after or something.
Honestly this wait and uncertainty of the Disney worlds is becoming a bit taxing on my mind at times. My gut is saying we are done, but I'm hoping there is still at least 1 left. Past interviews, development news, recent actor messups, etc etc just seems to be hinting at more to come for the big final push.