Users can effectively use the search bar to search for keywords, including location.. however I assume you're talking more of an advanced search or filter which has not yet been implemented. I believe there are plans to include a custom filter type of widget in a future release, although cannot 100% confirm it's coming in the next major release due out in September. You may wish to wait until details of this are confirmed, and the best place to find this out would be by following the
Appthemes blog which is where announcements are made.
