Is this a clue as to when the next version of Zbrush will be upon us?
Visit this page http://ugm.pixologic.com/registration/Seattle/ and then check each ‘get together’ listed in turn.
The first three mention directly that attendees, and I quote, “will be the first to see some exciting new Zbrush features that are on the way.”
The last one that mentions it is Wondercon April 2nd to the 4th.
The following invitation which is Rapid 2010 held May 18th to the 20th does not mention the above quote at all.
So sometime between April 4th and May 18th perhaps??? 
I know I am clutching at straws but I had a spare 5 minutes to find a theory and this is all I could come up with in the time available. "D 
Mike R