One of the things that's missing in the NEX-6 is the mic input jack. Sony has introduced on CES2013 an external mic, the Sony ECM-XYST1M that uses the new multi interface hotshoe. It retails for around US$149.00
Sony USA is accepting pre-orders with a delivery date of March 15, 2013.
|image from Sony USA website|
I am not sure yet if the power is drawn from the camera or it can be powered on its own. I would love to test this and try it against the Zoom H1 which I currently use.