[pyre]

I get the difference between a release upgrade and a rolling release schedule. My point was that when you are creating a release, you can say "this is the point where this change happens." With a rolling release, will a "apt-get upgrade" transition me? What if this was unexpected? What if this breaks my config?

For most normal upgrades this doesn't matter because the applications are usually fairly insular, but when you get into integrated systems like Desktop Environments it's different. Especially when Ubuntu is making a number of UI/etc changes to the desktop. It would be a bit surprising to have UI parts shift around. When you do a release upgrade, you know that there are going to be some major changes, and there are ChangeLog/notes on the release itself to tell you what major changes there are.