BBT will be built in at least 2 phases, starting immediately next to BTMR and then moving around RoA towards HM. The first half of those plans was originally suggested to be Encanto and Coco, at least one (if not both) of which are now slated for DAK. There have been some unsubstantiated rumors thrown out in regards to what will replace it (Zootopia, Cars, etc.), but it’s not clear right now. However, work on this project does seem likely to commence in the near future.
The second half was originally earmarked for villains, and there have been no indications that anything has changed on that front. However, building a land there would almost certainly require changes to RoA and the WDWRR, meaning that this phase is both less likely to happen and would take considerably longer to complete if it does. IOW I wouldn’t get my hopes up for villains anytime in the next decade.