Wacom is recommending that owners of Cintiq 27QHD and Cintiq 27QHD touch devices refrain from upgrading to OS X 10.11 at this time due compatibility issues. They are working on a fix. http://us.wacom.com/elcapitan?linkId=17413148
>>UPDATE: Wacom has released compatible drivers.

Wacom has released OS X 10.11 compatible drivers for most of their other models of tablets, with the exception of the Bamboo and Intuos Pen/Magna lines.  http://www.wacom.com/en-us/support/product-support/drivers