I'm waiting to see what the MTF charts look like, compared with the old ones. The DR too...how many stops? It could be a while though, with Canon's track record lately, they'll be $40-50 each and available "late 2013." Twice that for the ones with a red ring.
On a more serious note, has anyone actually done a study on using "dark frames" to calibrate sensor noise? Shoot a few frames with the lens-cap on (same exposure) and then shoot the subject... then "average" the dark frames and "subtract" them from the "real" shot in post, as in Astrophotography?
One wonders whether it may be possible to do the same "in-camera" by doing a pre-read of the sensor before the shutter actually opens...