At long last,that is about to change. Adobe and the IDPF announced yesterday that the new version of Adobe Digital Editions (and the Adobe RMSDK) were now available in a private beta.
Adobe DE 4.0 is the first version of Digital Editions to be based on the Readium Project, and thus it will be the first to also have support for much (but not all) of the Epub3 ebook format. While the current version of Adobe DE supports some features (vertical languages, for one), support for the Epub3 format is still incomplete.
The beta test is private, so in order to get into it you will need to send an email to [email protected], ask nicely, and then fill out a long form. I’ve already signed up, but I have yet to test anything. At the time I wrote this post, the only beta app available was for OSX. I run Windows.
And that is annoying, because I was looking forward to running the new app through the test suite at EpubTest.org. That site launched earlier this year with the goal of tracking Epub3 support across all ebook apps and devices. That is the site that tells us that the latest version of iBooks (3.2) supports about 61% of Epub3 features while the Kobo app for the iPad supports 66%.
Curiously enough, the app which supports the most Epub3 features is not the official Readium app for Chrome but a white-label Dutch app. Bureau van Dijk Reader claims a score of 82%. If you are interested, it seems to be the work of this fellow.
P.S. On a related note, yesterday’s announcement also mentioned that the new version of the Adobe RMSDK would be released in beta. According to the IDPF, it “supports new Adobe Content Server (ACS) features including subscriptions and other advanced transaction and distribution models”.