Veronica was supposedly popular in Embla, so the odds of a revolt are quite low I say. Frankly, I think the story will depend on how long IS wishes to draw it out. If Book III is the conclusion, it is likely that Loki will try to summon some demon dragon or something. If it isn't the conclusion, who knows? Nifl and Muspel came out of nowhere, so maybe a new kingdom we've never heard of will suddenly pop into existence and invade.