Flagship model: I'm guessing a 5 FPS model, 1.3x sensor (so that the whole DA line wouldn't get shafted), vertical grip built-in, SR, weather seals, probably 14MP model (though I'm not sure where they would source the sensor for this one - Samsung?).
AF speed would probably be fixed by the SDM lenses coming out. Auto AWB is still an issue though, and I hope it gets fixed with the new models (and if possible, via firmware updates for the existing ones.
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An in-betweener for the K100 and K10 would probably be something akin to the D40x. 10MP sensor, 1.5x crop, SR, pentamirror VF, bigger buffer for continuous shooting, no SDM, no seals, no battery grip (just to differentiate it from the K10D).
And once the K100 runs its course, the entry level would be an updated K100, with the same 6MP sensor, but with probably a bigger buffer.
Ben, drop hints if someone got it right, will you? No need to tell us who it is.