I've been sitting on this theory for a while now and I was going to wait until the international 1st-anniversary event to say something, but the recent trailer made me want to do it now. My theory is that the people in the sketch will be the new Union leaders to replace the Foretellers. The thought randomly came into my head when I was watching a UX stream, and I was like "How will Unions work with the Foretellers being 'dead'? " and then I remembered the sketch and that there were five people in it, and that's the exact number of Unions/foretellers there are. Given the recent trailer, I'm pretty sure this is the case because of the new title that it was given. As for who the other two might be.... I have an experimental theory that it might be Kairi and Lea, but that theory is very experimental like I said, so I'll wait before I share it, but it has something to do with present day Maleficent being in UX and KH3.