Remember last month when a Legen dary Hero banner was added to Fire Emblem Heroes and it became a lot easier to get a 5☆ Hero, thanks to an 8% chance. There’s also a new Legendary Hero thrown into the mix by the name of Gunnthrá, and you can see here for yourself here:
Given the fact she does seem to be a Book II character, there is a possibility that when the banner lands tomorrow, so might a new Chapter or 2 for the Book II storyline. We’ll keep you posted!
Source: Nintendo Mobile (Twitter)