Seems the Apple Watch that I ordered is harder to make than any of the others. 

The response to Apple Watch has surpassed our expectations in every way, and we are thrilled to bring it to more customers around the world,” said Jeff Williams, Apple’s senior vice president of Operations. “We’re also making great progress with the backlog of Apple Watch orders, and we thank our customers for their patience. All orders placed through May, with the sole exception of Apple Watch 42 mm Space Black Stainless Steel with Space Black Link Bracelet, will ship to customers within two weeks. At that time, we’ll also begin selling some models in our Apple Retail Stores.”

In a seperate email to those of us who ordered one, Apple offers this assurance: 

As you may have heard, some models of Apple Watch will soon be available for purchase in Apple Retail Stores. We’d like you to know that the model you ordered will not be available for purchase in Apple Retail Stores until all current online orders have shipped.

My guess is that the DLC coatin is proving especially hard to get right, at least to Apple's exacting standards.