I think that the ole 12mp ceiling guideline is way out of date. The 5D MkII proved that you can combine high pixel count with stellar high-ISO performance. Having said that, I don't yearn for 32MP. I'm pretty darn happy with the current setup; however, if the 5D MkIII could combine or improve on the Mk2's high-ISO performance AND deliver the greater image detail of the 7D, then I'd vote for it.
Canon's had three years of sensor development since the 5D2. They're constantly improving SNR, dynamic range and noise rejection. Applying the old 12-mps "rule", now five or six-years old, seems silly to me.
Dave
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