First of all, it looks really nice from the leaked images...way better than the other Z cameras. In this case I am a fan of the flip screen because it can be left closed (lol). I agree with the argument this camera shouldn't have video, but I respect the counter argument too.
This is going to look real silly with the F adapter and a 70's manual focus lens hanging off the front, so I have to imagine using legacy lenses is not really the intention of this camera. The 28/2.8 and 40/2 will be comfortable, and maybe there are some DX lenses coming to fill the wide gap, but without anything else I'm not sure how they expect to compete with Fujifilm, which has at least half a dozen different APS-C cameras and many excellent lenses at different price points. Nikon's 1.8 Z-mount primes are pretty large and expensive for this sub-$1000 crop-sensor camera.
Anyway, like others here, I have no interest in going back to APS-C. Wake me up when they make a full frame version.