Rolling shutter is a problem for stills too with high speed action such as small fast birds or balls/bats in sportsI think that it will be highly unlikely for twin slots as much as the 7D users would prefer it (with the same weather sealing).
No need for an expensive new BSI sensor with low rolling shutter when video won't be a priority and 10-14fps could be handled by an existing sensor.
I could be wrong but the pricing will dictate what the feature set will be. I think that it will be priced under the R6
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