I just saw in an email that Gabrielle Landi is making plans for the 4th book in the [series_link_13103] series and will be launching a Kickstarter project for it soon. 

https://www.kickstarter.com/projects/chickadeelanepress/once-upon-a-cat-a-cozy-fantasy-frog-prince-retelling?ref=profile_created&category_id=47

This Kickstarter is live now & here is the timeline listed Kickstarter:

Estimated timeline for this campaign:
August: Kickstarter campaign is running.
September-October: Final edits on the book, formatting, and proofing.
November-December: Ebook and digital reward delivery.
January: Physical reward delivery