Drupal 8 Form API Accessibility

For Drupal 8, one of the key areas that needs improvement is FAPI. This will also take significant coordination and good up-front design before we dive in coding.

Here's a PDF of the presentation I submitted for the Core Developer Summit about D8 Form API accessibility:
http://www.ojctech.com/sites/default/files/d8-fapi-a11y.pdf

Here is a more accessible HTML version of the same basic content:
http://groups.drupal.org/node/56703#comment-170798

I'd appreciate any feedback and suggestions.