Bluetracker
Tracks Blizzard employees across various accounts.
John Yang moved from Diablo team to WoW team
Just tweeted the following:
I moved from the @Diablo team to the @Warcraft team few months ago. Been focusing on primarily on Legendary Items for the Legion expansion.
Additionally, if you check his Twitter profile, you'll see it lists him as a Game Designer for World of Warcraft.
EDIT: It appears that Don Vu is also on the Legion team as of December 2015, according to his LinkedIn profile.
Kauza
Hey Foaks, just a reminder that people moving teams isn’t new for Blizzard. Legion is, of course, a big thing, and needs lots of awesome people like John.