I think that it would/ will be fascinating to explore the dynamic of other factions in the sense of them being incorporated 'allies' if you will, to battles.

For example, there could be a Ewok faction whose models could be incorporated, not into a squad of rebel troopers, but as their own functioning units under the control of the Rebel player. In this way, there could be a Rebel player controlling both rebels and Ewok allies.

Options include,

Rebellion

The previously-mentioned Ewoks

Wookies

Smugglers & Spies

Empire

Scum & Villainy

Trandoshens

etc.

Let me know your thoughts and what other ally factions you would include.

Interesting indeed. Would they be part of the chain of command and respond to standard order cards? Would they need their own commander unit? Could be fun to have a powerful, but somewhat erratic bounty hunter unit that 'plays by its own rules' and not always reliable.