The only news coming off of the PTR is that the disco ball object still has the placeholder tag on it ("[PH] Disco ball"), which means the name might be a little more formalized when it actually appears on the live realms. But this testing might answer one of the more pressing questions we've got about the Soul-trader -- we already know that any player (not just the one who summoned it) can exchange the "Etherium" currency that you use to buy items off of the vendor, but does that mean that any players who kill mobs that give experience or honor near the trader can gain currency, or only the person who summoned?
We'd assume that everyone can do it -- in that sense, getting this card is really like opening up a special vendor rather than just getting all the trader's items for yourself. And there's one more bit of news we can take from this: since these cards are going into stores on July 1st, we'll very likely see patch 2.4.3 on the live realms before then. To the PTR!