I would like to see some of the normal mounts like
Horses
Donkeys
and I want to see some new things like
Dragon = that lets you fly while riding it (draken style) you could fly from town to town and spit fire and have some air born fights.
Sea Horse = That lets you swim fast and see the ocean but you would have to breath underwater to ride.
Frog = How great would it be to hop into town on your own bull frog
If you have diffrent planes you can goto IE spirit plane as some people think there should be then make so mounts that can travel through them.
I also would like to be able to heal and revive my mounts and make a bond with them so that they follow my orders.