I have not heard that 85Cs were being discontinued but, rather, that the satin nickel finished models were being backordered.
CZ has, from time to time, talked about discontinuing that finish, and it may eventually happen.
In the meantime, we only know that they are in short supply and backordered.
Direct communication with CZ-USA might get you a definitive answer.
(Several years ago, CZ-USA floated a trial balloon about using silver polycoat instead of satin nickel and that idea was underwhelmed by the enthusiasm of potential buyers.)