Well, Matt Mullenweg has finally set a date for WordCamp 2007 (2006 link), and while it’s close, it is still a fair bit more notice than last time around.
There doesn’t seem to be a page yet for organizing the event, but with the date set at July 21st, and 22nd in San Francisco, they have a bit of time to plan it out.
I will have more information as it comes available. It should be an interesting event.