It would also go some way to redress the only real criticism of the current 7D, namely; not great low-light performance.Are you aware of a better-performing cropper in low light?
There isn't one - certainly not the D7000/Pentax K-5.
Bigger pixels do not make for better low light performance - this is uninformed internet hogwash for which there isn't a single Real World example that I'm aware of (although there are innumerable examples that disprove the notion) - and my 7D will happily produce fantastic low light/high ISO images all day long.
This appears contrary to the opinion of Canon in their white paper on full frame sensors.
"Regardless of format, full-frame sensors are all about image quality. The most
obvious advantage of full-frame sensors is the ability to combine high resolution
with large pixel sizes. Compare two sensors with the same number of pixels, one a
full-frame unit and one smaller. The pixels of the full-frame sensor are larger. Each
larger pixel has a greater surface area available for gathering light. More light
collected means less amplification needs to be applied to the output signal of each
pixel for the purposes of readout and image processing. Less is better here
because magnifying low-level signals inevitably entails picking up and increasing
noise that will then have to be removed as thoroughly as possible in a later step...."
"...In the extreme case of low-light photography and ISO ratings of 800 and above,
high signal-to-noise ratios give full-frame sensors a great advantage. In bright light
with low ISO settings, the abundant charge storage of Canon’s large CMOS pixels