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The added advantage of keeping the size of a mirrorless D5 or D810 the same as the current cameras is that the extra room will also allow Nikon designers to avoid one of the pitfalls of mirrorless - the build up of heat that causes them to shut down after a relatively short shooting time. It would also improve ISO performance as heat build up around the sensor hurts ISO performance. Nikon would be able to give components room to better dissipate heat and could also build in better heat dissipation than with current mirrorless.