so i was bored so i got my 20k mount lol
heres is a pic with me showing off my new mount with my old mount (polar bear mount) while wearing my murloc suit with my pet murky out(i like showing off hehe)
im waiting to get on the server to show another better pic lol
its very funny
edit: this is how it works, first mount up your big mount then mount with your other mount
edit 2: ive now done some research into this and discovered that this ONLY works on the polar bear mounts from blizzcon. this leads me to belive that the polar bear mount have a different program to make them work from a normal mount, it seems to be a new program that blizzard is working on for when mounts r mountable in water. my reasoning for this is because i can cast my polar bear mount in water but all that happens is the cloud of smoke aka it auto dismounts me but i can still mount in water kinda.
also while on my 20k mount i can walk around and move while mounting onto my polar bear.
edit 3: i found yet another bug, if you mount the 20k mount then mount the polar bear then click on the icon for the 20k mount it will dismount you from both mounts but leave the polar bears buff so that it will make you charater run faster like with the broom.