The support does seem to be in Adobe 1.8. Perhaps we will see the change to 1.8 in Kobo.
http://labs.adobe.com/technologies/digitaleditions1-8/
Quote:
Digital Editions 1.8 preview 2 (version 1.8.1) includes the following new features:
Japanese text layout support —Added support for Japanese text layout of EPUB documents authored to the EPUB3 specification. It does not support all of EPUB3. However, it does support many critical features, such as vertical mode, TCY, Ruby, Kenten and Kinsoku.
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