I said it some days ago already in another thread, but I'd like to talk about it with everybody:
What we have
We have our already known two factions:
Rebels: X-Wing, A-Wing, [YT] and [Y-Wing]
Imps: Tie's and [Firespray]
possible new Faction
Why the [..]? Because these Ships are not dedicated Ships just for that Faction. YTs, Firesprays and Y-Wings could also be operated by Scum like Smugglers, Black Sun, Nounty Hunters , etc.
possible new Ships
I'd say it's pretty sure that wave three will contain the Tie Bomber and the B-Wing, maybe a Lambda Shuttle and … what else? Regarding the canon, excluding the EU there is not much left. But if, and thats just me spinning thoughts, they'd make a z-95 Headhunter as cheap Rebel swarmer?
How it could come together
With said headhunter, they also could make a thrid faction by just brining out a cardset full of "Scum" Pilots for YT, Y-Wing, Firespray and Headhunters, which would be a great way of adding value by using existing stuff. If they want to put a cherry on top of that, they could bring out the existing ships in a slightly differnt paint scheme, without the whole process of developing new ship models, molds, production process etcpp.
As I said: that's just some musing, and won't happen, but I'd like to discuss it nontheless.