Even though I have absolutely zero interest in either of the announced lenses (and will NEVER buy a lens without a distance scale), I am not disappointed at all by the announcements. Why? Because the new DC lens seems to contain a replacement technology for the embarrassing, much-maligned SDM!
Based on the patent links that have been posted, the new DC focusing system seems to be a huge improvement. Yes, this is yet to be proved, but I am optimistic. And of course this SDM replacement will not be limited to the lens presented at Photokina; rather, it is certain to appear in future lenses as well.
Since I avoid SDM lenses like the plague that they are, the prospect of a more robust replacement has me quite excited!
Dan