Looks like the Sith have returned, so that a possibility.
And yes, that deep voice did sound suspect.
Max Von Sydow is in it (villain from Minority Report, also King Osric from
Conan, bodybuilding related
). He's 85 years old and I'm not sure what role he would be playing in a Star Wars movie other than a Sith Lord, although he kind of looks like Alec Guinness so maybe he's playing Obi-Wan's force ghost.
Some tit I've never heard of (Adam Driver?) is rumored to be the villain as well.