The Preferences have a new option "Switch to Clipping Set matching the current app's name". When checked, any Clip Set that has the name of an app will be activated when that app is open and its menu bar showing.
Version 5.6.0b1
You can now choose the type (flavor) a clipping is showing in the Pop-Up Preview window by holding down the Option (⌥) key when clicking on the bin's gear icon.
Possibly fixes a crash after a screen resolution change (I need you to send in any crashes you experience in this beta so that I can tell if it's not fixed).