The Sony RX1 is marked as discontinued at Digitalrev (Click here). They invite you to buy the RX1R instead but a real successor is likely to appear in early 2015. And I bet high this will have a curved sensor and 35mm f/1.8 Zeiss lens as shown on the patent here:
http://www.sonyalpharumors.com/sony-patent-discloses-the-new-35mm-f1-8-for-full-frame-mirrorless-nex-with-curved-sensor/