You should look up Q Ships, they ARE cargo vessels, they just happen to be armed cargo vessels, so that's 2 cargo vessels total in the 1.5 update, since the Panther Clipper is another cargo vessel, a very large one that we've gotten no real information on so far, much like the Imperial Cutter.
I don't know what Q ship is. From memory 1.5 will give us the Imperial Minifighter for CQC, the two huge combat ships, the Lakon Keelback (a combat ship as confirmed now), the Asp scout (probably not a trader given how the DBS is not a trader either) and the Viper Mk 4.
Is the Viper Mk 4 a "Q ship" and a cargo ship?
I have this weird feeling it is not.
At the very best the Asp scout is a multipurpose ship that can be a trader, but I don't see how you'd fit a trade ship between the Type 6 and the Asp, they're already way too similar in performance.
But dedicated traders we got nothing since launch.