It is not a interchangeable lens system camera but it could be a nice alternative of some mirrorless camera. The Sony RX100 has been officially announced and can be preordered now at Amazon US (Click here), Adorama (Click here) and BHphoto (Click here).
First preview and image sample can be seen here at Dpreview. Another preview is available at Imaging Resource. Some thoughts by Carl Garrard. Press release at ThePhoBlographer.
UPDATE: There is a first full RX100 review at Techradar and rates it with 4.5 of 5 points: “If we were assessing the camera based solely on what it is capable of outputting, it would be easy to say that this camera is near-on perfect for the target market.“
UPDATED_2: Another Full review at Imaging Resource: “As with the low-contrast crops, the high-contrast crops show the Sony RX100 besting the S100 and Nikon J1“