(SPOILERS) I haven't seen Rebels, but I was reading about Phoenix Home, and the Pelta-Class that we have gets destroyed, so they capture a Quasar-Fire and make it the new Phoenix Home. I don't know if they repaint it, but it would be cool if we at least get the option to run it as a Rebel ship. It would most likely have the same stats as an Imperial Quasar-Fire, but with Fleet Support upgrades, which are awesome.
I also wouldn't mind a new Corellian Corvette modelled after the Sundered Heart from Empire at War. They could make it the missile-firing (black dice), anti-squadron alternative to the CR-90. It would essentially fill the role of the DP20, because that thing uuugleee.
Sundered Heart DP20 Frigate