In a interview with dpreview, Phil Molyneux (President and Chief Operating Officer of Sony Electronics) talked again about the possibility of developing a full frame E-mount interchangeable lens camera:
Q: Looking at the VG900, our readers are speculating on whether you will make a full frame E-mount stills-oriented camera. What can you say to them?
A: The VG900 demonstrated that the E-mount lens mount can support a full frame sensor. Building the lenses that can cover a full frame imaging circle at that flange back distance is another matter. We'll see. The benefits of making a smaller camera with a full frame sensor and interchangeable lenses are clear. The E-mount that could do that would be a little different than the E-mount that we know today. But it is possible. Much of the lens geometry you see in the RX1 is what it would take to realize that design.