Originally posted by PiotrKrochmal first: true B&W without AA filtering and color signal only EV of every pixel. In that mode we will get 3x more resolution theoretically but I don't know how it will work in reality.
Do you realise that this cannot be done by changing the firmware?
What you suggest is only possible by physically removing the colour filters in front of the sensels on the sensor. So it is a hardware request and I doubt that Pentax will ever sell a pure B&W camera.
BTW, the resolution increase would be 2x the most (it is measured in a linear manner) but less than that in reality because modern demosaicing algorithms are able to restore some of the resolution loss by cross-referencing other colour channels (put simply). This works fine for most images and only in pathological cases you could detect that some of the resolution isn't real but had been reconstructed.
Originally posted by PiotrKrochmal Second: 3 in 1 B&W. After shot, 3 RAW will be written, for channels of RGB from one type of pixels. So we will get 1/3 of 16MP for each RAW but sometimes it could be worth.
Would would be the application for that? Also you could emulate it by just throwing away the colour channels you don't need.