B&H: no more Nikkor 50mm f/1.4D?

This is interesting:
go to B&H and search for Nikkor 50mm f/1.4D. The result is “out of stock”
now search for Nikkor 50mm f/1.8D. The result is “in stock” and “back ordered” for US and gray market respectively.
What is the difference between “out of stock” and “back-ordered”? Is B&H telling us that they will no longer “back-order” the Nikkor 50mm f/1.4D lens? Why not? Hmmm…