I have an Intuos Pen&Touch Medium (CTH-680) and was able to get it working in 13.10 using the information here:
The need to manually patch and compile the kernel support may sound frightening at first, but by carefully following the instructions, I succeeded at this as a relative layman.
If I understand correctly and you're using one of the new models like me, you'll want to pay close attention to the P&T-specific instructions in post 3 of the thread. These are where the patching comes in.
Getting the tablet working in general is easy; getting the buttons working including hotplugging is fiddly and I never succeeded at it. The script for the Wacom Manga submitted by a user at the end of the thread got the buttons on my P&T working once I added made that script executable and added it to my Startup Applications. The difference between "working" and "working including hotplugging" is that if I unplug and tablet and plug it back in, the buttons don't work until I run the script again.
It seems that 14.04 will support the new Intuoses out of the box, by the way.