Yep im wondering the same. Unless they release a Strix X370E in the next month I'll be going with the Crosshair VI Hero wifi ac. Money in hand waiting to buy now lol
You could buy a standard C6H board and buy the Wifi module its an Intel M2 2230 E key unit you will have to also buy 2 ariels and leads it fits in the M2 slot by the IO shield next to the 4 pin CPU power socket. Probably cheaper to do it yourself than pay over the odds. If you google the spec it will take you straight to it.
Just an update: B&H and Superbiz both have this board listed now(not in stock yet though) for $269.99 USD with B&H listing expected availability in 3-7 business days