So now that Series 9 is officially announced, let the speculation for Series 10 begin.
I am Sith and I have been discussing this at work.
Here's my best guess (based on his input too):
Anakin Skywalker
Obi-Wan Kenobi
Clone Trooper
Captain Tarrful
General Greivous
Padme Skywalker
Possible chases include, Sith Eyes Anakin, Mace Windu, Commander Cody, Galactic Marine