See the official discontinued lens list here, even the DFA 55/2.8 SDM and DFA 90/2.8 Macro SR lenses are now included:
So, the Pentax 645 digital lineup is really done, as it is shown and can be confirmed, regardless of any official statement made about this fact. :-( And, those 645 gear of Pentax has become collectors' items now, just like the Q gear.