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I did a calculation a while ago about the sensors.
The K10 has a pixel pitch of about 6 microns, or 10 times the wavelength (average of all colors) of light. The K20 will be about 5 microns. Soon, there will be a practical limit due to having sensors dispersed at very small integral spacings of the wavelength. We will need to deal with difraction and other problems at each sensor as things get smaller.
I suspect, as a result, we are approaching a practical limit, and there is only one way forward from that point, bigger sensors. (beyond full frame. Long Live Medium Format!)
As many have stated the resolution is now reaching the limits of lenses, therefore one of the next improvements will also need to include different lens technology, better materials and processes, etc...
Noise is also a big issue, and considering the capabilities of both current sensors and lenses, I would see improvements in noise, color, image processing speed, wider ISO range and a whole host of other improvements at the current (14MP on ASP-C sensor) resolution as more important than going to the next step in pixel count
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