The Brightest Night (book)
From Wings of Fire Fandom Mirror
The Brightest Night, the fifth and final novel of the Wings of Fire series, will be published on April 29, 2014. It is announced that Sunny, the SandWing of the dragonets of destiny, will be the main protagonist.

This book follows The Dark Secret.
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Sunny
Summary
The fifth book will revolve around the SandWing dragonet, Sunny, the last hatched. In this book, the dragonets will struggle to fulfill the prophecy, reunite the tribes, choose the SandWing queen... and make it out alive.
It is also mentioned in Tui's blog that we will briefly meet a SandWing dragonet based off of one of Tui's sons.