When the 1DX dropped, a quote from Canon was something along the lines of "we listened to a lot of pros and what they wanted from a camera", ie, things like the Ethernet port.
I wouldn't be surprised if Nikon listened to a lot of the same pros and put their own Ethernet port in, it's waay too soon for them to have just hacked it in since the 1DX was announced.
But I still call this a mashup of 1DX and D3s-improved wishlist...