Think of the new Sony RX10 as an RX100 II with a large telephoto lens. Based on the same 1" 20MP sensor as the RX100 II, the RX10 has a Carl Zeiss Vario Sonnar T* 24-200mm zoom lens with an f/2.8 constant maximum aperture. The RX10 uses a new Bionz X image processor, and will come with a 3" tilting LCD, OLED electronic viewfinder, built-in Wi-Fi with NFC and 1080/50p video recording.
The RX10 comes with a new-generation Direct Drive SSM (Super Sonicwave Motor) which promises faster contrast-detection AF, and the camera can shoot up to 10 frames per second with continuous AF. The local retail price hasn't been announced but DP Review has it at US$1,300. The Sony RX10 will be available here in November.