It looks to me like putting up mini pets and mounts to be bought with real money has been milked for all its worth, so naturally the next thing to do is let players pay real money to pick the way their armor and weapon looks.
I can easily see Blizz letting people buy their way out of having to actually have the armor set in storage to use its look, or even creating new armor set looks that only players who pay real money for it get to use its look.