I am not going to waste my breath telling you what Nikon Df is, you can Google it yourself and go over the 66,100,000 results ;)
According to Nikon...
Rediscover the joy of photography.
As digital camera technology has evolved, so has the way we control our cameras. Mechanical dials have given way to buttons, menu systems and LCD displays. But what if we could blend the elegant, simplistic control and styling of classic Nikon film cameras like the F, F3 and FM/FE series with the advanced technology of Nikon's exceptional new D-SLRs?