I have try with Google Rich Snippets test tool some articles with customer reviews. They are not seen with star rating on the preview.
But there is defintly some data about review seen in the RDFa section.
According to Google tools :
There are 2 fields mandatory : itemreviewed and reviewer
In what google see from woocommerce page, there is no reviewer but an author. And there is no itemreviewed but an item (this seems ok from the same page)
And maybe some other gliches with non-mandatory fields.
Is this fixable with modifying the product page ? Will it be solve in future release ?
Seems so near to what is needed, don't want to use external plugin to do it (like GD Rating Stars)