Why do I have a feeling this will involve Darth Plagueis and “The Acolytes of the Beyond” leading into the history of who they are and how they end up worshipping Palpatine. I think Exegol and TROS references will be high in this one.
I think there was a report awhile back that they planned to do more with Exegol, in some shape or form, so I think you may be onto something there.