Jump would not be a problem if it's controlled. I personally don't want to see a player jumping constantly. I know some players are thinking of using jump as a method of getting over some of the annoying crevices, hills, and choppy terrain in the game. Instead, better collision should be implemented.
Overall I don't believe jump will be a problem with the game if implemented with controls on it. But at the moment I don't think focus should be on jump at all. There are a lot more important things in development that the dev. teams should stay focused on. So in the future maybe jump, but I will not be mad if it comes or not.