Wikidata usage is when the English Wikipedia starts using its data. It has. There is even a category for templates that use Wikidata data. This category is linked to Wikidata as well and there are more Wikipedias that have a similar category.
This list is obviously not complete; the Occitan Wikipedia for instance is not included.
It is exciting to learn about this at the very end of 2013. Next year will be even better.