Seems like Xur doesn't just travel to the Tower to sell his wares, but also is a vendor at Dalaran at a completely different game.
Pretty cool.
Article here:
http://www.gamespot.com/articles/destinys-xur-appears-in-world-of-warcrafts-new-exp/1100-6442298/
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They're both activision properties right? They could do a full on crossover if they wanted to, unlikely as that is. I'm not exactly a fan of destiny, but this is pretty cool.