If, like me, you bought the Grand Expedition Yak (at an obscene price) because you just had to have a reforger on your mount -- maybe you have as big a problem as I do with the concept of monetary value, I don't know -- you were probably slightly saddened to discover that reforging was leaving the game. For it meant that you would no longer have a reforger right there on your mount for that one time you used it for yourself before ending up the entire raid's reforge buddy when they all got new gear.
But now with reforging gone, we've all been asking what Mystic Birdhat's ultimate fate would be. Would he simply be removed? Would he be replaced with someone else? No and no. Instead, he's now apparently a transmogrification vendor, and there was much rejoicing. Now, be warned, this is the Alpha. Things are subject to change. I couldn't actually get Mystic Birdhat to transmog any of my gear - he just sat there, smug about his new job description.