There's been some more details about this upcoming TV series, which will apparently take place in the later days of the High Republic (around 100 years before TPM) but start to see the Sith's plans start to go in motion. Apparently it will bring back some EU elements, but of course remixed for the Disney continuity. I'm kind of curious which ones. Some are speculating Revan, but there's already some reboot of KOTOR in development that would probably deal with that. I'm guessing that perhaps the series might involve perhaps Darth Plageuis, or his own Master. Amanda Stenberg is being considered for the main role; however I think it's more likely that she's playing a Jedi hero who perhaps investigates this dark side resurgence.