Wave IV added expansion packs for the Interdictor-class Star Destroyer and the MC80 Liberty type Star Cruiser. Wave III added expansion packs featuring the Gozanti Assault Carriers and the GR-75 Medium Trransports. Wave II added expansion packs featuring the Imperial-class Star Destroyer, the MC30c Frigate, the Home One, various small-ships in the Rogues and Villains, and the Imperial Raider, the last of which had previously been announced as an expansion pack for X-Wing Miniatures.
Wave I expansions, aside from separate releases of the vessels already present in the Base pack, add a Assault Frigate Mark II, Gladiator-class Star Destroyer, and various squadrons of starfighters.