GNOME sessions with gnome-shell 3.21.91-2 and libwacom2 0.22-1 still segfault when any any of my USB tablet devices are attached. This includes the Wacom USB Wireless Accessory Kit: it's fine after being plugged in initially without the tablet being turned on, but when the tablet is turned on and begins communicating wirelessly, the session dies just as above.
I've tried a plain old USB optical mouse, a USB keyboard, and a couple of USB joypads too - those are unaffected. >From the console, libwacom-list-local-devices 0.22 detects the plugged device and lists its features like it should. No segfaults there.