As the adoption of Phabricator for Wikimedia project planning groes, the likeliness of users willing to see Phabricator generated data in wiki pages will grow. The main use case is lists of tasks based on predefined queries (i.e. open tasks of project X). There might be also an interest in transclusing the content of a task (title, description, metadata) in a wiki page.
We had pursued a similar goal with Bugzilla, see T29001: Bugzilla integration extension (for filing bug reports). And see also T58287: Allow embedding RSS feeds from Phabricator into mediawiki.org.