I think that the hierarchy is intact, meaning that all the buy/sell orders who were entered in the quote book on the last day APII traded are still listed, they're just being trade-frozen due the CUSIP change, but the dept in bid/ask was still there.
once again I can sell my shares so if Im low seller I set the price MMs only reflect what someone has for sale or willing to buy, provided of course that AON orders need not be displayed