The release highlights include:

  Priority Messages
  Improvements of Comprehensions
  Smarter Error Suggestions
  Improvements to the Shell
  New erlang:hibernate/0
  Warnings for Use of Old-style Catch
  PCRE2
  Optimizations to TLS 1.3
  Based Floating Point Literals
  Nominal Types
  New Emacs Erlang Mode

If you use the built-in Emacs mode, I made a simple script to automate configuration of your .emacs file for it...

https://github.com/dlachausse/erlmacs