Asobinet reports that the Pentax DA 560mm f/5.6 ED AW APS-C lens for K-mount is already discontinued in Japan.
Update: the lens is also listed as discontinued on the official Ricoh/Pentax website.
In the US the lens still in stock at Adorama (special order at B&H).
Here are a few Pentax DA 560mm f/5.6 ED AW lens videos:
