I think that PROXY is pretty much a lock. And I also think that Kazdan Paratus is pretty likely, too. He's an Aleena, and I could see Hasbro retooling Tsui Choi into a Kazdan Paratus figure.
I would also expect some troopers, too. Especially since Hasbro has stated that packs like these are going to depend significantly on existing tools.
As for Galen Marek? I think we're going to see figures that are similar to the Evolutions offering, but with a new headsculpt that's more like the actor whose likeness was the final template for the Secret Apprentice.