That one you'll have to troubleshoot with Wacom.
My Intuos 1 and 2 tablets are still working just fine with CS6.
An update: I brought my WACOM Bamboo to work to see if it was perhaps the Intuos2 itself that was giving me trouble. After uninstalling the drivers for the Intuos2 and installing the drivers for the Bamboo (downloaded from WACOM so they were the most up-to-date) I tested the pressure sensitivity. The problem persists.
I don't know what to do. Unless WACOM has failed on the drivers on two completely different tablets, both of which work fine outside of photoshop, I can't see how it is their fault that Photoshop doesn't recognize them. I will keep trying different things to try to fix the problem.
Contact Wacom, and they'll walk you through troubleshooting.
Photoshop recognizes tablet pressure for millions of other users, but not you.
So you're going to have to work with the tablet maker to figure out what is going wrong on your system.