Reuters is stating that "Nikon Corp will enter the market for lightweight, interchangeable-lens digital cameras and release its first product with a mirrorless design later this year".
There have been many rumors about a Nikon MILC coming soon, but the Reuters report certainly adds substantiation to those rumors.
Also stated was: "The Nikkei said Canon has also reported researching the mechanism and other technologies to develop small, lightweight digital cameras and could enter this market in the future."
While a mirrorless design has some advantages, I will not be excited if the sensor choice is smaller than APS-C.