While I'm not crazy about the center-button-lock dial design -- Canon does this too -- I generally prefer this kind of mode dial to the electronically set modes on the higher-end cameras. The D600's is basically the same as the D7000's, with the exception of that button.
No design surprises here: the D600 control layout will look familiar to anyone used to shooting Nikon, down to the multicontroller rocker switch I'm not fond of. I do like the location and operation of the Live View/Movie switch, though.
The out-of-focus port (sorry!) is a connector for a wired remote, a micro version of Nikon's standard 10-pin port. There are headphone and mic jacks for audio recording during video shoots, and the HDMI can output an uncompressed signal for hard-disk recording as well as a clean signal without information overlays to a second monitor.