Maybe your config had /dev/wacom instead of the new /dev/input/wacom? There was a xorg update soon after wacom-tools was updated, so it should be fixed by now.
Hotplug is still at its infancy, hopefully by feisty+1 wacom-tools supports input-hotplug provided by xorg-server. Now it is just a hack, it seems.
Maybe your config had /dev/wacom instead of the new /dev/input/wacom? There was a xorg update soon after wacom-tools was updated, so it should be fixed by now.
Hotplug is still at its infancy, hopefully by feisty+1 wacom-tools supports input-hotplug provided by xorg-server. Now it is just a hack, it seems.