My guess is that it is going to be at least six months to a year.
Major changes to menu items is a huge deal. It's not just Emeril handing Carnival some of his recipes. Approval by the beards is probably a drawn-out process. All the ingredients have to be sourced, all of the cooks and dining room staff have to be trained, all of the printed and electronic information (menus, etc.) have to be redone. And I am sure there will be a big PR campaign involved.