Posting the subtopics in the context of this thread helps me, hopefully it is helpful to others.
The proposed subtopics for the Sprint
- Volto aka plone-react
- Content quality checking
- Accessibility improvements
- Contextual image alt text
- Improved accessibility for overlays, dialogs, and menus
- ATAG 2.0 Part B compliance: single page and site-wide compliance checkers
- Incorporate a11y checking into travis/jenkins process
- Parity between Plone 5 and Volto for accessibility features
- Supporting service workers for improved performance
- Plone 5 UX improvements