It seems there's consensus that HTML microdata ist dead, with RDFa as a replacement for those who care: manu.sporny.org/2013/microda…
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@stilkov It would appear that there is still strong usage of Microdata in Russia, with Yandex. Unlikely to save it though. @simonstl
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Replying to @robinberjon
@robinberjon @simonstl It seems Yandex supports RDFa (Lite) too

Aug 16, 2013 · 8:11 AM UTC

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Replying to @stilkov
@stilkov They do, but they've been indicating that MD is still largely dominant. @simonstl