Wall mounted my new QN95B yesterday, all looks well (didn't think it could improve on the QN95A image quality but somehow they have done it).
No HDMI dropouts yet (that is the reason the QN95A was replaced).
Used the Samsung 2021 Slim Fit Wall Mount (WMN-A50EB/XC) with the QN95A mounting unchanged (it was an absolute PITA to mount the QN95A so a very happy bunny), I just needed to use the shorter screws for the hinges at the back of the TV as the QN95B is slimmer (again, I don't know how they did it, the QN95A is already slim).
If you are mounting from scratch you can use both instructions included in the pack but the ones applicable to the QN95B are those for the QN800A. I guess Samsung is going to simply update the instructions, call it WMN-B50EB/XC and sell it for a premium to unsuspecting buyers.
TV is sitting flush, 7.5mm from the wall across all sides (the QN95A was a bit over 1cm at the top), the totally flat back seems to help with that.
Early days yet but I am very pleased (so is the gamer son, no more swearing at the TV, won't miss that part of the QN95A experience).