UPDATE 2/24/2021 – Now it is on early access store.
Previously caught FCC filing of U6 Pro access point (ref) appeared to have never made to early access store. However, U6-Pro is still being developed and recently U6-PROR named new device showed up on FCC. I assume R here stands for revised/revision.
Here is a description of the device from FCC document.
The U6-Pro is a dual-band WiFi6 (802.11ax) access point that represents the next generation of competitively priced, prosumer wireless technology for home and enterprise users. Delivering blazing throughput speeds of up to 5.3 Gbps over its 5 and 2.4GHz channels. The U6-Pro utilizes a4x4 5 GHz radio and a 2×2 2.4 GHzradio and is powered by 802.3at POE. The EUT uses an integral antenna with a gain of 6 dBi in the 5 GHz range and 3 dBi in the 2.4 GHz range.
https://fccid.io/SWX-U6PROR/Test-Report/DTS-15-247-01-WiFi-Report-5128903
UPDATE 2/24/2021
160 MHz Channel width 4×4 WiFi 6 5GHz band
Based on the total throughput of 5.3 Gbps in contrast to 3 Gbps on U6-LR, which is also 4×4 Wi-Fi 6 5 GHz band, we can safely deduce U6-Pro will support full 4×4 160 MHz channel width. This gives 4.8 Gbps throughput rating on its own.
2×2 WiFi 6 2.4 GHz band
From Wi-Fi 4 (802.11n) to Wi-Fi 5 (802.11ac) did not have any change/upgrade to 2.4 GHz band. However, with Wi-Fi 6, 2.4 GHz band also saw some jump. Actually, significant jump of 2x throughput improvement from previous generation 2.4 GHz connection (ref). However, currently publicly available U6-LR nor U6-Lite supports Wi-Fi 6 version of 2.4 GHz. U6-Pro will have rating of 5.3-4.8 = 500 Mbps throughput on 2×2.
UPDATE 2/24/2021 – Strange, 573.5 Mbps number for 2×2 2.4 GHz is simply confirming Wi-Fi 6 version of 2.4 GHz. This is because in Wi-Fi 6, 40 MHz Channel width 2.4 GHz has max speed of 286.8 Mbps per stream.
This is not Wi-Fi 6E
There is no 6 GHz band support listed i.e. this is not Wi-Fi 6E. So 160 MHz channel bandwidth is still likely not usable/practical for majority of users.
N-Base T support?
This is still uncertain. With 5.3 Gbps total rated Wi-Fi throughput, we can technically expect ~2.5 Gbps potential throughput if 4×4 MIMO at 160 MHz channel width can be achieved. This is different from U6 LR where it has 4×4 MIMO Wi-Fi 6 but its rating is 2.4 Gbps on 5 GHz band. This is most likely its 160 MHz is 2×2 reduced version. So practically U6-LR can only achieve 1.2 Gbps on 5 GHz band. This may be why Ubiquiti decided to keep U6-LR ethernet port to 1 Gbps cap.
I would be really surprised if U6-ProP does not support 2.5 Gbps ethernet port.