Adobe has not announced any public plans for support of ePub 3. The next version of ADE (1.8 or 2.0 depending upon what they decide) does not contain support for ePub 3.
The current version of RMSDK (9.3.1) does not contain support for ePub 3 (but does have have support for Ruby and other things needed to properly render CJK documents).
Unfortunately now that I am no longer working for Adobe, I'm even more constrained about talking about their future plans ( there are some ).
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