Sony has announced the a7R II, a 42.4MP mirrorless camera with an image stabilized full-frame BSI CMOS sensor. Unlike its predecessor, the camera includes on-sensor phase detection elements for faster autofocus, which continues to work with other brands' lenses. The camera also has a revised shutter mechanism, rated to 500,000 actuations but also promising less vibration than the one on its predecessor. The sensor is by far the largest backside illuminated CMOS chip to be released, allowing the maximum expanded ISO to rise two stops to 102,400. The camera will cost around $3,200.

Source: Sony a7R II has 42.4MP on 4K-capable full frame BSI CMOS sensor: Digital Photography Review