I pulled the current list of ships that the First Order Navy and Resistance Navy used from Wookieepedia and although I'm not saying whether or not it's a good time to bring the sequel trilogy into Armada, there seems to be enough ships in the First Order and Resistance navies to make a wave or two at this point.
First Order:
Corvettes
Cruisers
Gunships
Frigates
Platforms
Shuttles
Star Destroyers
Star Dreadnoughts
Starfighters of the First Order's TIE pilot corps
- TIE/fo space superiority fighters[2]
- TIE/sf space superiority fighters[15]
- TIE/vn space superiority fighters[25]
-
Resistance Navy:
Bombers
Corvettes
Cruisers
Freighters
Frigates
Shuttles
Starfighters of the Resistance Starfighter Corps
- RZ-1 A-wing interceptors[8]
- RZ-2 A-wing starfighters[18]
- T-70 X-wing fighters[3]
- T-85 X-wings[7]
- Y-wing starfighters[19]
Transports