The only Ignition predictions that I have heard so far is that the Subjugator heavy cruiser will have it to represent the giant ion pulse cannons, but I think that there is more Ignition possibilities like the Munificent frigate.
The reason Munificents could take on Star Destroyers like the Venator was because of those very large twin turbolaser cannons, which are bigger than even the ISD's main guns. It shouldn't be as big of a dice pool as the Onager, but Ignition doesn't have to be limited to superweapons and it would make the Munificent more interesting than just a heavy front arc.
Do you want to see more Ignition ships, and what ships do you think might have the ability?