I had this on pre-order with Amazon, but as you say they only 'had' the USNI edition, which they now have ben unable to source, so my pre-order was summarilly cancelled. Raised 'Merry Hell' with them, and after a couple of emails, got a telephone call from Customer Services, and the guy realised that they had a 'glitch' in their systems and they still had the Seaforth edition available for 'pre-order', so I made a new order, which he verified, now I have to be patient a little longer, but should get it soon (I hope!).
Never hurts to find the 'right' person to raise a problem with, now (hopefully) I will get my copy.......