Since the 'Wings of Fire' series is known for its rich world - building, the 'next wings of fire graphic novel' may expand on that. It could show more about the history of the dragon tribes, their unique cultures, and how they interact with the environment around them. Maybe it will bring in some new magical elements or prophecies that the characters have to deal with. There could be epic battles, both physical and mental, as the dragons strive to protect their own or achieve their goals in this complex and dangerous world.
I don't have the exact release date. You can check the official website of the publisher or some book - selling platforms for the most accurate information.
Sorry, I don't have the exact date for you. You might want to keep an eye on the official announcements from the publisher or the author's social media.