Nikon to introduce APS-C mirrorless....

Not really. The appeal of Nikon mirrorless is the large number of superb lenses in F-mount. I would love to have my Nikon AF lenses to be attached to a mirrorless body retaining a full functionality. In fact, if Nikon takes Sony sensors and puts them in mirrorless bodies with F-mount, Sony may be a toast. Let's face it, apart from the stellar sensors Sony doesn't have much to offer, the bodies and lenses are nothing to write home about.