Finally, we have got to know the cause of delay occurring in the announcement of Canon full-frame mirrorless camera. The reason is the issue with the mount type of this camera.
However, according to the news published over Canonwatch, the camera should have an adapted version of the EF-M mount. Additionally, Canon is also searching way through which they can fit EF lenses on a full-frame mirrorless body. Well, the prototypes of this full frame mirrorless camera are being tested in the laboratories and Canon will soon find the precaution measures to fix the issue with the full frame lenses, which they may introduce at any point of 2016(may be at the end of 2016).