Okay, after "pkg upgrade" I got my graphical drivers and Xorg back! 
Sound works, GUI works.
I was using the iwm driver for my Intel AC 8260 — and after update it stopped initialize and wlan0 interface couldn't be added to the my aggregate interface lagg0.
Before, I was using iwm driver, not the iwlwifi, because the second could not be added to the lagg0 (it showed some cryptic error about SIOC80211). But after update tables turned — and my WiFi interface could be added to the aggregate interface with iwlwifi driver.
Couldn't say that WiFi speeds dramatically changed in comparison with 14.3 — I see the same numbers as before in my experiments with iwlwifi in 14.3.
Sadly, the problem with waking up laptop still exists — most of the times it works, but sometimes the CPU fan starts to spin for a second and after some time system powering off with message "CPU temperature is too high, shutting down" in the console 
Possibly, something in my system is misconfigured and overloads the CPU after wake up.
