As you know it is the Sony 36 Megapixel Full Frame sensor that powers the current Nikon D800 topseller camera (Click here to see the ranking). And as far as I know Nikon has a (one year?) exclusivity on that sensor. DxOmark just tested the sensor quality (Click here). It beats all current FF sensors and “is comparable to the best medium-format sensor, and in fact does even better — much better — as ISO increases.” It shows that Sony sensor technology greatly improved during the last couple of years. Even Canon has to worry.
My guess is that the Canon 5DmarkIII is loosing his war against the Nikon D800. This may be a chance for Sony if they don’t wait to much. A double SLT FF camera announcement (24 and 36 Megapixels) would probably be the right thing to do!