Good news for all Emacsers who have a copy of Mickey Petersen’s excellent Mastering Emacs: Mickey has updated the book to cover Emacs 28. You can read the “2022 Edition Update” section of the book at the previous link but the TL;DR is that the big change is, of course, native compilation and that Emacs 28 otherwise consists of incremental changes to many aspects of Emacs. You can read the section or Mickey’s longer treatise on what’s new in Emacs 28 for details.
If you currently own the book, you’ve probably already received an email from Mickey alerting you to the update. You can get the update for free by using the secure link for updating that you originally used to get the book and subsequent updates.
If you don’t yet own a copy, now’s a good time to get one. You can buy it for only $28.79 at the Mastering Emacs site. It’s a great book and one every Emacs user should have.