Quote Originally Posted by Matsume View Post
Two words: Yoshis's Story (no pun intended)

Furthermore, I am pretty sure Yoshidasan has discussed jumping in one of the LIVE producer letters in which he explains that jumping on mounts is highly unlikely to be implemented. If I knew just where to look I would post the Link, but alas the videos tend to be lengthy (one or two hours) and I am not interested in spending that much time searching for this.
He did mention it, mostly due to terrain issues, it's why if they ever do implement the system hopefully it's tied to Chocobos more so than random mounts because they can do so much more with it that way.