I think the problem with creating a dedicated 40mm prime compact is whether the camera company believes it will sell. Over the years, the shortest wide angle I've seen in a modern camera is 38mm, and that was in a Casio point and shoot from 2005. The Fuji Klasse S from 2006 was 38mm f2.8, but since then, it has been discontinued and the Klasse W (28mm) has stayed. The Leica X1 was 36mm, but the X 113 is 35mm.
The Fuji X100 is a slightly different matter, as it is a camera that appeals very specifically to a certain market: the photography minded retro/film/rangefinder people (us). Everyone who is into this 'stuff' knows the Ricoh GR series. But a pocketable compact like the Nikon A has to get past the immediate visual impression of 'consumer camera'.
I'm sure if Ricoh made a 40mm GR it would sell like water in the desert, because photographers and enthusiasts already know and love the Ricoh compacts. Nikon, not so much.
Edited to add: since the Coolpix A has gone on sale, I've been thinking about grabbing one, almost for the sake of having one at such a good price. But I already have the GR and love it, and as far as I can see, image quality is the same and functionally the GR is as good and better. Getting a Nikon A would be a waste for me.
Edited to add more: I just found a Ricoh patent for a 27mm f1.9 lens for aps-c, which would be 40mm! I know that companies often create patents without creating the product, but this gives a bit of hope. Either that, or it's a Pentax DSLR lens (ugh).
http://ricehigh.blogspot.com/2013/01/new-ricohs-aps-c-lens-patents-23mm-f25.html