I'm not sure about Jabba have PT battledroids (he has a finally balanced deal with the Imperials which I don't think would be allowed to happen after ROTS if he had been an out and out Seperatist).
It might be good to see some salvaged Seperatist materiel being used by the Rebels though (especially if the Seperatists were reworked to be the forerunners of some of the Rebels).
Someone did suggest incorporating a salvaged downed AT-AT into the Ewok village as proof that they had already fought the Imperials after seeing this image:
