Looks like a great option for Nikon (or potential) Nikon shooters. Having watched the DPR and Fro's video's, it seems to me that getting beyond the press release and a quick read of the specs this isn't overall better than the A1 or R3. Particularly compared to the R3, I see it specs higher on MP count, low-light AF, and dual CFExpress slots. Sure, there are other things like FPS, but there are plenty of caveats to go along with those. Ultimately, when viewed not on individual specs but overall capability/usability, it achieves parity with the R3 but certainly not better (other than price).
It may be just me, but I'm curious about the repeated references to the Nikon designed and developed sensor. In the past, where Nikon used sensors manufactured by Sony, were they Sony designs as well, or did Nikon design and hire out Sony's manufacture? I'm guessing that's the case the way this sensor is being described, I really don't know though.
So, of course time will tell, but I'm sure it will be well received. As do all product nowadays, in due course it will have many fans and some detractors, too. Between the three big dogs in this race, they all eventually will push each other and incorporate features pioneered by the other so if for no other reason that than, I'm glad to see this announcement.