802.11n, 802.11ac, and 80211ax will now be known as Wi-Fi 4, Wi-Fi 5, and Wi-Fi 6, respectively. Wireless products launching in 2019 or later will use the new naming convention in their specifications list to better help customers compare and contrast wireless features.
https://www.notebookcheck.net/Wi-Fi-Alliance-thinks-802-11ac-is-too-confusing-for-the-public-will-now-rebrand-it-as-Wi-Fi-5.337006.0.html
What about 802.11ad?
They should have used letters like A, B, C instead of numbers. Wifi 5 is actually more confusing as there is also phrases like 5ghz and 5g for mobile. Too much room for confusion.
Unfortunate.