The full frame Canon 6D has just been formally unveiled as Photokina opens for the press. A competitor to the Nikon D600 (also to be unveiled today) this is a near identical camera to the 5D Mark III in many respects especially video it seems. But like the 60D compared to the 7D, it is cheaper and smaller.
It features a new 20MP sensor but a similar (if not identical) DIGIC 5+ processor of the 5D Mark III.
It has built in WiFi and GPS unlike the bigger brother. The only real compromises seem to be in the AF system, lack of 100% viewfinder, lack of headphone jack, slightly slower burst rate for stills and lack of left side button panel.