Wikisource, Wiktionary, Wikiquote and Wikivoyage and that is indeed welcome news.
There is one puzzling part in the information; "Wikidata and Wikispecies are not within the scope of this feature." It is puzzling because including Wikidata search results is where search has been augmented for years in many Wikipedias including the English Wikipedia by the people who added this little bit of magic Magnus provided.
As you can see in the screenshot of the search for Wilbur R. Leopold, an award was conferred on him and the origin of this factoid is the article on the award. Thanks to Wikidata, information is available for Mr Leopold. There are so many references in Wikidata that have no article in a Wikipedia or any other project that from a search perspective it is probably the next frontier.
When wiki links, red links and even black links can be associated with Wikidata items, it becomes even easier to add precision to the search results. Adding these links is the low hanging fruit to improved quality in Wikimedia projects anyway.