On 2018-09-24 the EPUB 3 Community Group published a draft of the following specification:
Note that the specification is nearly finished, and we are encouraging feedback from the community. EPUB 3.2 consists of several interrelated specifications:
- EPUB 3.2.
- EPUB 3.2 Overview.
- EPUB 3.2 Content Documents.
- EPUB 3.2 Packages.
- EPUB 3.2 Media Overlays.
- EPUB 3.2 Open Container Format (OCF).
- EPUB 3.2 Changes from 3.0.1.
If you have any questions, please contact the group on their public list: firstname.lastname@example.org. Learn more about the EPUB 3 Community Group.