I think it would be safe to say that after the first few waves of Clone Wars rolls out, we would most likely get a era specific Rogues and Villains.
Who would you like to see?
For villains: Cad Bane, Jango Fett, maybe Aurra Sing, maybe Zam Wessel. Hondo again?
Rogues: harder to think of, members of the bad batch, Jedi who walk the line is questionable tactics ala Quinlan Vos.
I'm currently rewatching Clone Wars, so these were some thoughts.
Who would you like to see?