Clawdite, for all your infiltration needs
Dug, for another brute/hired muscle style race.
Falleen, for the under world crime boss or avenger for their city getting razed (which is non-canon now, but still.)
Jawa, because Jawa mechanic/Outlaw Tech.
Neimoidians, for the shameless greedy merchant nemesis.
Shistavanen, for hunter/scout.
Of the bunch, I think the Shistavanen are the least likely to happen due to being rather obscure and, well, just a basic 'wolfman' race. Falleen and Clawdites might be a long shot too, with both possibly difficult to balance with special abilities and the Falleen now of dubious canonicty. Dugs are just a matter of finding the right book to fit them in. I'd be shocked if Jawa's and Neimoidians didn't make it in.