What makes more sense at this point is to start adding a paragraph about Wikidata to the Tech News as they are rather than having a whole separate translatable newsletter. In the Tech News there's a whole paragraph every week about the VisualEditor, and there are short updates about CirrusSearch and MediaViewer almost every week. A weekly update about Wikidata can be there, too. If a whole paragraph is too long, a couple of the most important points would be a good beginning.
It takes me less than ten minutes a week to translate each whole Tech News issue. Adding a few sentences about Wikidata should add no more than two minutes to the time that the translators already invest. I think that it's perfectly doable.