It’s super-early in the process, but the Second Edition of the Scala Cookbook is slowly coming to life. I’m currently updating all of the content for Scala 2.13, and when the book is finished it will be updated for Scala 3.
This morning (January 28, 2020) the folks at O’Reilly released the first two chapters of the new, updated book on the O’Reilly Learning Platform. If you have an O’Reilly account you can start reading the new chapters here. If not, you can view the catalog page here.