I think that the at st down mini campaign is one of the cooler releases that ffg has done. I would love to see some more unique or assymetrical objectives and campaigns in the future.
Here's a few of my ideas:
Escort mission: move a VIP from one side of the board to the other. Could include a rebel informant and imperial spy mini (garindan!)
Downed pilot: a stationary mini in the middle of the map with a short range attack. One side needs to capture it the other side needs to rescue. Includes rebel and imperial pilot minis and maybe some wreckage terrain.
Any other ideas?