Originally posted by Pål Jensen 24mp doesn't make sense in an FF camera. Particularly for a company that excels in image quality. FF for the sake of it is not the Pentax way.
But it might for high ISO performance. That's why Canon has its 20MP 1DX series and its 51mp 5DS.
I personally don't have much need for a 36mp image, and since I shoot raw, they would fill my hard drive pretty quickly, but the main reason I'd consider upgrading to a FF camera is for better high ISO performance.
A 24mp FF camera would interest me, as it shouldn't give me bigger raw files, but should offer considerably better low light performance than a 24mp APS-C sensor.
Of course the kind of use for this kind of camera is likely to be sports, wildlife, etc, so it would need excellent AF to match the ISO performance, and there'd need to be some long lenses.