There isn't reason to celebrate, unfortunately.
The blog post mentions only Wikipedia links. And, in fact, doing a search on
test.viaf.org, you will get only records containing links to Wikipedia.
See for example the JSON formated record for Jane Austen:
Wikidata entry for Jane Austen points also to 1 Wikibooks page, 22 Wikiquote pages, & Wikisource pages and 1 Wikimedia Commons page.
I'm not particularly surprised on this, since the Wikimedia Foundation never does nothing to help "sister" projects (in fact, only puts dozens of barriers to allow/approve changes in MediaWiki for those and, recently, started to put barriers to approve local chapters actions on non-Wikipedias wikis, as we can see on some past messages on this list).
[[User:555]]