Originally posted by toukan my question is whether the 12 bit RAW capture of the K-30 is something that could upgraded to 14-bit through a firmware update, or is it inherent in the design of the camera, and thus not subject to alteration later.
Number of bits of the A/D converter (and hence the RAW) is a hardware thing, it cannot be upgraded with a firmware update. The image sensor outputs an analog voltage, which is proportional to a number of photons that hit the pixel, and this voltage needs to be digitalized into something that is interpretable to computers. A/D converter does that. The difference between the 12bit and 14bit converter is in an extra electronic circuit of transistors, resistors, capacitors, ... and this is on the lowest level of the hardware.
As you said, it is inherent to the design of the camera, and thus cannot be a subject to alteration later.