Shame on me; I didn't notice that the Ubuntu image had switched to the countdown for 12.10, or to use its codename, "Quantal Quetzal". The second beta is out, so I should have realized.
What's new, you ask? Quite a bit--best visit the 12.10 Beta 2 Ubuntu Wiki page for details. There are changes to X and the proprietary nVidia driver (the latter of particular interest to those of you running with multiple monitors).
Eight days to go... at least as I type this.