I've sold a fourth novel!
From Publishers Weekly's Rights Report: Week of September 12, 2016:
Phoebe Yeh at Crown has bought The Dragon Squire by Lou Anders, a middle grade medieval twist on Freaky Friday, in which an arrogant dragon and a hapless young squire switch bodies after a spell goes awry. Publication is slated for summer 2018; Barry Goldblatt at Barry Goldblatt Literary sold world English rights.
Thanks to my agent and my editor! I'm very excited.