I know I've mentioned it before, but I think the best move is a "Separatist holdout" faction. There's a lot of content that works well for Separatist ships and if there is canon references to the Separatists still being around, that might work. I don't feel like the Separatists really fit well with the Rebellion in terms of ideals.
I have to believe that the Venator and Acclamator will show up for the Imperials soon.
Besides that, there might be a few starfighter designs, but there's a glut of squadrons out there that aren't being used and I don't really care to have more fighter stands to try to store.
Edit: I also want players to have the option of not buying things they dislike. One of my problems with X-wing is that there is a push to get people to buy ships they aren't particularly interested in. There is a market for Prequel stuff, but don't force those of us who aren't a fan to buy it if we want to keep up with the factions we do like.
Edited by ricefrisbeetreats