A friend mine went brag mode in skype yesterday getting this thing and it does look awesome so I wanted to share! If you want your mount to become literally plain white like this and yes you can move with it for about 10 mins with an 1 hour CD :O
http://i.imgur.com/MzKsb.jpg
It's from a rarespawn via in vale of eternal and it spawns from what I've gathered to about every 1 hour to two hours from camping him for 12 hours straight getting the dumb thing