I waited for a long time to see what Nikon would do with mirrorless (post Nikon 1 and aborted DL), I was hoping for a small, rangefinder style body with a DX sensor and some small, quality primes to go with it (16/2.8, 23/2, etc). But then came the rumours and eventual announcement, and it seemed like only FX mirrorless was likely at the outset. So my answer from your poll choices is Zs, but I'd prefer it in DX instead of FX.
For my more serious work I still think the FX dslr and my set of lenses is more suitable.
I'd love to upgrade my D800E to a D850, but oh, the price.
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Peter
http://www.flickr.com/photos/pw-pix/