I am looking for information on the state of accessibility for the Plone CMS. Whereas historically Plone used to be considered the most accessible CMS around, it is difficult to get a precise picture of where this CMS is at today in terms of accessibility support. The Plone website is woefully missing basic information about the accessibility standards it supports and the accessibility statement is shockingly out of date. If I were to believe what it says, Plone has not heard of WCAG 2.0...
Further research has yielded little more, aside from a few Pen State powerpoint presentations from 2011-2012 that discuss WCAG 2.0 and Aria but it is difficult to know what exactly is supported or not and where this work is at.
So, any information at this point would be appreciated.
 http://weblion.psu.edu/symposium/2011/2011-talks/plone-accessibility (there was another presentation but unfortunately, as a new user, I am only allowed two links in my post...)