Is there any realease notes anywhere?
A place to see what is new in a new release?
Just click on the release date on the main avast.com page (in the left column).
Well hidden. Links should look like links (at least change when mouse is over).
And when I searched the web-site for “release notes” nothing came up either
When you go to the page of the particular product (Products / Desktop Protection / avast! 4 Professional, for example), there’s a link to “Revision history” in the left column.