The Commons reconciliation service should have a property suggest service which offers an auto-complete API for the properties supported by the service.
For instance, when typing "depi" in a property input, the service should suggest depicts (P180).
When typing "wikit", the service should suggest "wikitext" as a property.
The implementation should use the wbsearchentities action of the Wikidata API to suggest properties.
This functionality can be tested using the test bench and OpenRefine.
No flyout service should be implemented.