UPDATE 8/21/2020 – U6-Pro Added
Quick summary of revealed UniFi Wi-Fi 6 APs to this date so far relative to the comparison products of the current generation. I speculate there will be two more Wi-Fi 6 APs on its way.
U6-Lite has the same form factor as nanoHD but lacks 4×4 5GHz whereas U6-LR has 4×4 5GHz and only $20 more than nanoHD but not just the same form factor as nanoHD. So my guess is there won’t be any specific device replacing nanoHD.
Pro is Wave 1 product and 3×3 MIMO, so I highly doubt there will be any new replacement.
The difference between HD and SHD on paper could have been big with SHD having its own security built into AP and real time radiofrequency analysis could have been utilized to implement perhaps real time Wi-Fi AI (channel adjustment) like in Cisco; however, this has not happened to this date, so my suspicion is SHD line won’t be released at least for awhile. So with this, my guess is there are only two more potential U6 versions of product could be on its horizon.
U6-Pro (U6-HD)
UPDATE 8/21/2020: This is now confirmed and on FCC. However, it turned out to have 300 Mbps 2.4 GHz band i.e. aggregate speed is essentially the same as U6-LR, IW and Mesh.
Originally, written.
First is HD replacement. Since HD stands for High density and Wi-Fi 6 is really designed for multiple devices connected at once/congested network in mind at its core, the naming convention of HD may no longer makes sense. So I would surmise it will be called like U6-Pro.
This version will have Wi-Fi 6 version of 2.4 GHz band. In Wi-Fi 6, 4×4 2.4 GHz can support up to 1148 Mbps total throughput. According to small network builder, it is actually 2.4 GHz band that saw more drastic improvement over 5 GHz band. With it, real aggregate throughput is expected to go over 1 Gbps; therefore, 2.5 Gbps ethernet port is expected to be in place. The latter is supported by the recent early access store listing of UniFi 6 switch 24.
U6-XG
The major addition of this line is the third band. So this will be tri-band version of U6-Pro. In home or small office environment, tri-band system has a true value in a setting of wireless mesh link i.e. wireless backhaul between access points. This is because one band can be used as dedicated connection between APs; hence, it provides solid backbone with substantial speed gain. However, their revealed extender and mesh do not have the third band so this utility is extremely limited unless one buys two U6-XG, which would be not the smart way to spend money.