I believe all the concierge rooms are on the 5th floor, but it may be possible to get concierge privileges extended to rooms on other floors. Seems I've read that others have done so...
As for balconies... NO, not all rooms come with full balconies at the BC, including on the concierge floor. You can request one with your reservation -- no guarantees though. I've read somewhere that the rooms on the 5th floor are slightly larger but not sure if that's true. You can also request a GV on the Crescent Lake side -- again it's just a request but some of those views are quite nice...