I know we have discused here the possibility of card-only boosters to add new pilots to existing ships.
I would love to particularly get new astromechs. Although there is a good variety curently with a singel wave, the second wave will not have any new astromech upgrades that can change the flavor of the current ships in the way that the new ship modifications, missile types, and (perhaps - speculating) cannon weapons will.
Homebrews are cool, but anyone else here want some new droids? There was a thread for a bit on A Few Maneuvers about releasing an R2-KT charity release. That would be really great. But some general release upgrades as well would be awesome after Wave 2, particularly if Wave 3 takes another year to get released.