Last year when Hasbro released the Spacetrooper, it had shoulder pads, a jetpack, and a droid bit. The droid bit is gone, and now that he's shipping from Hasbro in Saga Legends packaging, he's got a new (to him) gun. (The ammo thing isn't on the side like a Stormtrooper gun, rather it appears similar to a redeco of Wioslea's weapon.) Click through for bigger pics.
...that's pretty much all I got. This particular flavor of the gun is exclusive to this release of this figure (so far). Other new figures in the wave include a Death Star Trooper and Boba Fett repack, but this was the most significant change in here.