Oops a typo. I meant xf86-input-wacom-0.16.0 in case you wanted to update that too although it shouldn't be necessary. And 0.17.0 was released yesterday.
You should be able to determine the needed kernel header by running uname -r. Likely generic is correct.
On some systems the wacom.ko won't autoload which I'm guessing is your problem. So you add wacom to the end of the list in the modules file in /etc:
and then restart. You should see wacom in lsmod then.
gksudo gedit /etc/modules
You didn't install a Wacom driver dkms at some point did you?