Since the militaries line is what I'm aiming for only, I'm looking forward to a Hoth Rebel Soldier... Their uniforms are intricately designed so I'd like to see what SS is capable of coming up with. Hasbro's Hoth figures featured some of the only decent detail that line ever churned out so SS has its work cut out for them I think...
Add to that all the details like all the troops having a sidearm, the bulky modular backpacks, the detail of the hat/hood/helmet and such... I think it'll be interesting to see.
I'd love to see SS going the route of Dragon with their uber details, like undershirts, underwear, suspenders, "survival" gear, etc... I'd pay the premium price I think for a soldier where you got EVERYTHING he would've had in the field. From a cold weather shelter to eating utensils, I'd buy it for sure, even if not seen in the films.