You have seen a number of 802.11ax tests already here at Guru3D and there are more reviews inbound, but the standard was not yet even officially a certification. The Wi-Fi certified 6 certification program from Wi-Fi Alliance is now availablefor 802.11ax.... Wi-Fi 6 Officially has launched and certified as 802.11ax
802.11a, 802.11b, 802.11g, 802.11n (Wi-Fi 4), 802.11h, 802.11i, 802.11-2007, 802.11-2012, 802.11ac (Wi-Fi 5), 802.11ad, 802.11af, 802.11-2016, 802.11ah, 802.11ai, 802.11aj, 802.11aq, 802.11ax (Wi-Fi 6), 802.11ay. Yeah, pretty easy to remember. Its not like the alphabet is in any particular order...
Business owner: "So i hear there is a new wi-fi that is supposed to be better than ever. How do we adopt it?" Hapless IT guy(me): "Well sir, we have to throw away all our access points, and completely redo every bit of wi-fi infrastructure in order to adopt it." Business owner: "Ha, ha......no really, what do we need to do?"