The MX-1 is the best selling fixed-lens camera over Christmas on kakaku.com! This represents a large number of online retailers in Japan, but certainly not all retailers. Even so, this a good showing for Pentax.
http://kakaku.com/camera/digital-camera/ranking_0050/
(I'm posting this on December 27, but the ranking will change if viewed at a later date)
I can only imagine that the classic styling of the camera is what appeals to Japanese customers. Perhaps this might convince Ricoh to make a successor, or even apply the retro look to a camera in another segment.