Launched today, Pentax have brought out a monochrome version of the aps-c format K-3 III.
As I understand it, by having no Bayer filter array, each pixel on the sensor records what it sees, without any interpolation.
This should lead to more accurate tones, effectively increased resolution, and better high ISO performance.
I am not sure how much "better", and whether it will tempt me, but there seems to be demand for it especially from Pentax users in Japan.