I don’t think anything overly credible or detailed has been mentioned yet. I’ve heard a range of rumors from dragon on a stick to purely projection to Maleficent B-mode.
In terms of the rest of the show, I’m inclined to suspect it’s 2.0, with just the pirates swap. Popcorn bags have been using the same artwork as before with Rapunzel and Simba. They still are in the show descriptions as well.
Would love to see some pacing, visual, and vocal updates though!
The main update I am wishing for is them doing away with Mickey’s “ooh’s” and “ahh’s” and awkwardly added dialogue throughout.