I would also like to see the Hutt Cartel make an appearance. Maybe the Hutt Cartel vs. the Chiss Ascendancy. Obviously exclude Thrawn, otherwise the Hutts would be completely owned.
Edit: And how about the Killiks (from the Swarm War, not the TOR ones)?
Nah - we need to have a Chiss Ascendancy WITH Thrawn. We ought to pare 'em up with one of our best Kaggath peoples yet due to the fact that Thrawn is a wizard. Seriously, Thrawn is the most Kaggath-deserving guy out there.