No Starch intends to send AO2e to the printer on 22 March 2013. This would give a “bound book date” of approximately 12 April. Books would be in their hands roughly 19 April. They’re really good about shipping books to purchasers as soon as possible.
Note that DNSSec Mastery should be available in ebook form about then. Not only do I have two books coming in 2013, I have two books coming in April 2013.
All dates are subject to change based on the whim of the printer, phase of the moon, gasoline shortages, insurrections and iniquity and incivility, or any other reason whatsoever.