as per last PTS patch (clockwork city), four new motifs are ingame
54 : bloodforge (from bloodroot forge dungeon)
55 : dreadhorn (from Falkreath Demise dungeon)
56 : apostle
57 : ebonshadow
note that motif 53 : Clockwork is not yet available though datamined, it's the style from the "War machine" and other sets from Halls of Fabrication