It is interesting that Nikon chose a unique focal length of 26mm.
I'm not familiar with the situation outside Japane, but here in Japan, some market researches tells that there are a lot of people who become interested in the photography jump right into the full-frame world from the smartphone. And the 26mm on FX offers the very angle-of-view that the "standard lens" of the smartphone camera.
It behaves as the equivalent of a 40mm lens on a DX body, which, of course makes the perfect sense, too.