"Grand Marshall" would seem to be the natural next title and possibly another higher level mount. Maybe a mount with a jet engine... call it "Falcon"

But the transfer option is very much needed.

Also as Herby pointed out, Dragon was only out for about 3 - 4 weeks. but some people may have invested gems to "tame" it.

It would be great if the experience was "transferred" without any pre-conditions or penalties since the experience needed at each higher mount is significantly greater. This way people can purchase the new mounts and use gems or daily feeds without worrying about losing their investments when the transfer option is made available.