...maybe.
From the Association of American Publishers comes a last ditch effort to save epub3 by killing epub3 and replacing it with a de-bloated version:
AAP EPUB 3 Implementation Project.
Via
Digital Reader.
Quote:
AAP publishers are currently recruiting representation from all stakeholder groups to participate in the initiative’s two central efforts:
Convening this summer: A working group to identify baseline accessibility features for the EPUB 3 files and for metadata, and to plan the program for the September workshop
September 10, 2013: A daylong workshop for all participants in New York City to define and prioritize actionable projects
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With that timeline they'll be lucky to get the spec implemented in readers for Xmas 2014. Which says epub3 not only won't be ready this year, they don't expect it to be ready next year either.