I know your area of expertise is the USA, but do you have any guess on the EU release?
(btw
http://www.onyxboox.com/ has had 05/02/2011 as the release date for a while now, thought it was the 5th of feb at the time, but since it is an American site it's probably May and as it is pretty near your date it might be an official unofficial (as in internal) release date)