The changelog isn't very detailed to say the least. There have been many fixes which haven't been mentioned here that I can see:
The UI should auto fit the screen resolution if the UI was too big.
The Avast account is back in GUI,
Many UI issues have been fixed,
Virus chest dialog are fixed.
When running a scan and the toaster was opened, when scan completed, the toaster would show scan cancelled. That has been fixed.