Both the RX1 and the RX1r are no more available at Adorama and available on special order only at BHphoto. You can only see a very limited quantity in Stock at Amazon. The RX1RII is obviously still in Stock but the fact that the first generation is fading out might be still a sign that the RX1RII price might be lowered and a new model might come out soon.
It’s unclear of Sony will make a Full Frame or a Medium Format successor. We also reported many times about Sony’s curved sensor FF and MF patents. I expect the next High End RX camera to show some very new unique features.