As I have just received today, Linux Kongress 2009 has shifted its dates to October 27 through October 30 (and changed the Location from Hamburg to Dresden).
This is good news, since it no longer collides with Linux Plumbers Conference 2009 on September 23rd through 25th. I guess that many speakers and some attendees would otherwise have ran into scheduling problems - with many preferring Linux Plumbers.
Also, the Call for Papers is out, it runs until August 31st, i.e. you (yes you, the reader!) have more than four weeks of time to decide what kind of topic you want to talk about :)