Three Guys With Cameras has a well thought-out essay about Nikon's soon to be released Df digital SLR. Each 'Guy' raises plaudits and concerns with the new camera. Plusses amount to the use of the D4 sensor. Essential caveats are that the Df sacrifices ergonomic functionality for both manual and automatic lens shooters. Each Guy notes that it is much larger and more complicated than the film cameras it attempts to emulate on the outside.
The Guys are polite in dishing out their conclusion, that the Df is a Frankenstein's monster attempt to hit all market points with one product.
I tend to agree, though with more vociferation. I had considered selling my D800 for the Df back when the only thing known about it was that it would be a digital FM. Instead, I purchased a Sony a7r and Novoflex adapter.