Well, the original idea was that the confirmation screen would only show up if you were trying to log out from a different session than the one you're actually using right now.

For example, say you had a browser window open in your regular account, then you open a new one, log out, and then log into another account. That log out would be one-step, as it should be.

But let's say that you now go back to your first browser window, which is still on an old screen, and try to log out of that window. Because you're not *actually* logged into the same session that you were back when that page was loaded, you'll get the confirmation screen.

That was the way it used to work, and that's what DW will be going back to. It was never intentional for the double confirmation to be displayed in all situations. :D