Wings of Fire: Winglets is a series of e-books written by Tui T. Sutherland as a companion to the Wings of Fire series.
The fourth Winglets book is titled Runaway, which is told from Foeslayer's, Snowflake's and Prince Arctic's perspectives. It was released on September 27, 2016. For plot details, see its individual page.
Tui T. Sutherland has confirmed that the next (fifth) Winglets may be called Dragonslayer, about Flower (Rose) and the other two Scavengers, Holler and Fluffy. This might be a Legends book if not a Winglets.
The first three Winglets (Prisoners, Assassin, and Deserter) have been released as a paperback collection called A Winglets Collection: The First Three Stories. In the shipping details, the book was first available to be ordered and arrived by late September or early October of 2016.