Following the W3C Workshop on electronic books in NYC two weeks ago, Dave Cramer (Hachette), Hadrien Gardeur (Feedbooks) and myself (Disruptive Innovations) have started a new Google Group called EPUB NG. Don't misunderstand us, it's called EPUB New Generation only because we needed a name and we start from what's available on the market right now, EPUB3. We're not forking, we're not doing a secret thing, we only needed a space where we could start discussions about the largest issues I found in current specs and what Dave recently called EPUB Zero.
So if you're interested in throwing ideas about a new, simpler, lighter format for electronic books more in line with W3C standards and Web habits, start reading us and ping one of us to request an invite. Please detail your affiliation and background in the electronic books' space? Thanks!