While I will not be purchasing one of these as I have the Nikkor 85 f/1.4, it would certainly be on my shopping list as a serious contender for travelling light and running 28mm, 50mm and then this small 90mm for my longest focal length.
The best part is the filter size, at 52mm and with the 90mm included in a travelling kit, one could use the same HN-2 lens hood and the same filters across all three lenses. A bit short for the 90mm, but certainly usable and better than nothing.
The cost of this lens being $800 AUD, is certainly around the price of current Nikkor 85 1.4 lens. Admittedly not really in the same ball park with regard to outright speed, I would suggest that wouldn't matter. I think the pricing is good, the physical size is good, the filter ring size is good and that scalloped focusing ring should be divine to use with the metal helices.
Thanks for this information Henning, much appreciated.