I just received an e-mail from Amptec (the Benelux DPA distributor) saying that these are shipping! As they put it, "We were overwhelmed by demand since the initial announcement, so if you are interested in obtaining a unit, contact us ASAP."
musicstore.de is listing them at € 569 and "Snel leverbaar, 5-7 werkdagen" (available quickly, 5 - 7 work days). B&H has them listed at $ 659.95, but no availability as of yet...