I have gotten no cosmetics as drops yet. Got that Ashava horn from the second beta though!
Semi off-topic: I’m still a bit confused about the loot goblin. I have still seen less than 10 of them after a slow (doing many side quests etc) playthrough of the campaign. And of the ones I have killed or almost killed, I think the loot is really lackluster for being such a rare and special encounter. I have gotten only 1-3 rares per goblin. And compared to what the legendary drop rate is throughout the game, the loot goblins seem to fill no function apart for being rare themselves.
Maybe it’s because I spent most time there, but I think that Kyovashad is the nicest hub. It’s the only town where I don’t have to check the map find anything.