Water Strider Mount images via Wowhead.
I think the Water Strider Mounts coming in Mists of Pandaria are the coolest and most unique of the new mounts.
I mean they can walk on water!
You must be Exalted with The Anglers faction in order to buy the mounts.
They cost 5,000 gold.
There are 5 different Water Strider Mounts:
Reins of the Azure Water Strider
Reins of the Crimson Water Strider
Reins of the Orange Water Strider
Reins of the Jade Water Stride
Reins of the Golden Water Strider