Subterranean Press posted that Blue World has been sent to the printers. The signed, limited edition hardcover is still available in both states, numbered (1,000 copies) and lettered (52 copies). It is due in August 2015. You can pre-order a copy from Subterranean Press on their site.
Subterranean Press is also publishing a trade paperback edition of Blue World in September, along with trade paperback editions of They Thirst and The Hunter from the Woods. They also have a specially-priced, signed set of all three paperbacks that can be pre-ordered here.