This release implements mainly a new UI for three components:

  • Tools list
  • Settings
  • Connection controls

What's new for users

Improvements
New UI for connection controls : You can set a logo for your connection folders
New UI for settings 
New UI for tools list
You can name the current XrmToolBox window the way you want (See Windows menu in XrmToolBox - thanks to @fowl2)
Bug fixes

N/A

Known issues
Opening Power Apps maker portal might goes to default environment instead of connected environment. The issue comes from Connection controls and will be fixed in a future release of these controls

What's new for developers

Improvements

Use of .Net Framework 4.8

Bug fixes
N/A
Known issues
N/A

What's new for administators

Improvements
N/A