Update: It appears that Surface Pro 3 Docking Station is actually now available for preorder in many other countries (beyond the US and Canada) and not just the UK. I've updated the article title (but not the article below) and am waiting on a full country list. --Paul
Microsoft curiously claimed yesterday that "the Surface Pro 3 Docking Station is available today for preorder." As it turns out, that accessory has been available for preorder since late June—I ordered mine on June 21, a bit over a month ago. But what's changed is that the Surface Pro 3 Docking Station can now be preordered in the UK.
Curious that Microsoft didn't actually state that in a blog post that ostensibly announces, ahem, that preorder.
Instead, the post focuses on the benefits of the coming device, which will provide a ton of desktop expansion capabilities, including 3 USB 3.0 ports (in addition to the one on the Surface Pro 3, which can be used simultaneously), 2 USB 2.0 ports, gigabit Ethernet, one miniDisplayPort (in addition to the one on the Surface Pro 3, which can be used simultaneously), an audio jack and a security lock. As I noted in my article, Surface Pro 3: Desktop PC Replacement?, this appears to be a serious impressive desktop solution. (Which is especially true if you used the Surface Pro 2 Docking Station, given the improvements.)
Anyway. On June 20, Microsoft made the Surface Pro 3 Docking Station available for preorder in the US and Canada only. Those preorders will ship to customers on August 15.
What's new, apparently, is that you can now preorder this Docking Station in the UK as well. Those units will go on sale on September 12, and that is presumably the date that preorders will start shipping. UK pricing is 165 pounds, or about $281, well over the accessory's $200 price in the US.