For me, there is still the niggling thought that this is something new and untried by Nikon, whereas Sony already has a good start on the market, has been delivering full-frame mirrorless camera bodies and native lenses for some time now and they are continuing to expand their offerings in lenses. In addition to that, third-party manufacturers also are producing E-moun for APS-C cameras and FE-mount lenses for Sony full-frame cameras, too, which broadens the lens base considerably, providing more choices for the consumer at different price levels.
There is also the question of how well those native F-mount lenses, especially the older ones, are actually going to work on the adapter and with the highly-sophisticated electronics of the mirrorless body. The lens which produces a wonderful image on a D3, for instance, may look like crap on the new mirrorless cameras. Some people have already noticed this to a certain extent with Nikon's most recent high-end DSLRs. Who wants to plunk down $$$$ on a new camera and then have their lenses not really all that great in terms of resolving power and image quality after all so that then they're pretty much forced into buying new lenses and at this point, there are only three from which to choose....!!??!!
Happily for me I am in no rush so am going to keep an eye on things tomorrow and over the next few weeks or months as Nikon rolls out the cameras and the lenses and people begin using them, shooting with them in all kinds of situations, all kinds of lighting conditions, weather conditions, etc.
