EPUB 3 is the newest revision of the EPUB standard. EPUB 3 is being developed pursuant to a charter approved by the IDPF Membership in May, 2010. On February 15, 2011, the IDPF published the first Public Draft of the EPUB 3 specifications.All comments on EPUB 3 specifications should be submitted via the EPUB 3 Working Group Issue Tracker, hosted on Google Code. NOTE: you must login via a Google Account in order to submit an issue. Please submit spec comments with the label «Type-ReviewComment» and additional label(s) as appropriate for the particular issue, e.g. «Spec-Publications».
Ну, наконец-то. Среди обязательных стребований к рендерингу — поддержка шрифтов.