When you browse to the Gigabyte Aorus pages you'll notice that there is a countdown active, basically that would be the preorder for X399 motherboards. The countdown expires 16hrs from writing this news-item.
And that means that preorders start on the 27th. That also means we'll tee the official announcements tomorrow. The motherboard pictured in the pre-orde page is AORUX X399 GAMING 7. I'd advise to stay away from pre-orders until we have tested a couple of boards so you can make your purchases based on an informed decision.
Countdown Shows Ryzen Threadripper Mobo PreOrder date