Picture of new dewback set:
Link
Are the sandtroopers new (in terms of deco)?
I think they both may be: One has a black pauldron (new for GH), and the other MIGHT be retooled (holding a regular blaster instead of the rifle, and holding some sort of dewback-prodding electrostaff in the other hand).
That said, I'm not too sure about the possibly retooled one. From the angle, I can't be positive that it's a blaster and not the rifle, and I'm pretty sure I'm not seeing the electrostaff thing that was in the Toyfair photo. The boxed photo has a few other differences from what Hasbro had in their Toyfair presentation, including 2 fewer figures:
Toyfair also showed a third Sandtrooper (dirty with white pauldron, like in the Cantina Encounter)
Toyfair also showed another Garindan repack (for some reason)
Toyfair showed Chewie with the stormtrooper blaster; this one is back to his cool bowcaster