Wacum, on their site, does describe how to update their drivers when Apple does in update, but it does not go into detail so I called them and asked a real person how to do it. Then I wrote down, in detail, exactly what I had to do, step by step. This is for the Bamboo Capture, but I suspect you follow the same steps, just making sure you download the correct driver for your Tablet. Call Wacum to ask exactly which driver is the one for your tablet.
How to update your Wacum Tablet with a Mac update: these exact directions are for a Bamboo Capture and Yosemite
You first want to save (backup) your Wacom Tablet preferences, like what right clicking on mouse does when connected to your tablet and what your pen preferences are. If your tablet preferences are set to DEFAULT, don't worry about saving them. If you have changed from default to something different go to your
Applications folder > double click Wacom Utility > current user >backup > save ( saving it just as it is, puts the preferences in the Wacom Utility folder with that day's date so you can find the latest preferences.)
Do the same thing again as above but this time, instead of leaving "Wacom Tablet," click on up/down arrow next to "Wacom Tablet", and change it to "Documents". At bottom left of page, click on NEW FOLDER and create a "Wacom folder", click CREATE and then save to that folder. Now you have a double backup of your latest preferences.
You are set to Download Yosemite
Once you are running on Yosemite you have the Bamboo Tablet Drive that no longer works.
You want to remove the old Bamboo software. So go to:
Applications folder > double click Wacom Utility > current user >tablet software> remove
OK! Now you want to install the newest Wacum Drive for your Bamboo Tablet
Go to http://cdn.wacom.com/u/productsupport/drivers/mac/consumer/pentablet 5.3.6-6.dmg This is the new driver software for Yosemite from Wacom for Bamboo Tablets. You can also get to the software by going to www.us.wacom.com/en/support/drivers and scroll down to Bamboo Tablets...not Pads, be careful not to click on the wrong download. This will begin the download on your Mac which will show up in the upper right hand corner of the home screen, as an arrow pointing down. Click on the arrow, choose the top download and double click. Follow the instructions that come up.
Now you want to make sure the new software knows your preferences. Go to your DOCUMENTS > wacom Tablet (that you set up as per above instructions ) > latest preferences ( which should say "Preferences.tabletprefs") > double click which should update your preferences in Yosemite.
If that doesn't work, go to Applications folder > Wacom Utility > double click > click on current user > click on RESTORE that should put your preferences back into your computer.