This co-located event for 2011 will be held at Berlin's Humboldt University from the 6th to 12th of August. LinuxTag in Berlin is held at the Berlin Messe and the Chaos Communication Congress at the Berliner Congress Center, but having the Desktop Summit at Humboldt University on Unter den Linden should be actually quite convenient and definitely easier than at the Messe in terms of travel.
The announcement of the dates and location can be found at KDENews.org. There may be live coverage of the 2011 Desktop Summit on Phoronix. If you're interested in such live coverage, let us know on the forums.