That is a fine question. Soon as you see one, let us know. Mine is a '14 with the flat metal at the discharge opening and has never caused one bit of discharge problems. If the new SD54 comes in with the bar, don't let it keep you from climbing about and destroying the grass in your yard. You'll most likely be as happy with it as I have been with my old '14 model.
Keep us informed kind Sir.
Max