Yoshi-P didnt say that they werent going to implement it, its just being put on the backburner for now because the foundation of the entire game, actual substantial content and the battle system, are much more important than having the option to jump at this time. As a reply to an earlier post, yes, auto attack is THAT important as it stands, because unless they get the base of the combat system right, no one will care whether you can jump or not.
Also i'm sure they have to go back and do mocap for the jump animations to get them just right, if they decide to implement jump, whether an auto-jump or manual jump.