Fire II gets a trait that turns it into a means of switching to AF3 in AOE, sort of like what they did to Freeze to switch to UI3 in AOE. It'll probably have it as a low level change and not something that gets earned from leveling 80-90 like another job might get because it's the developer's baby.

As for the rest of the kit I really don't know how they could expand it. Maybe an Ice equivalent of Despair that would grant an immediate stack of Polyglot or something, but I'm not sure how that would effect the flow of the job.