I'm pretty happy that Sony and Nikon are announcing product and then getting it out the door quickly. I've got several friends who are trying to decide whether to get the Nex7 or the Nex6 as upgrades from their Nex5n's. It's an interesting trade off. The Nex 6 sensor seems to be a better performer in low light and the on sensor phase detection should help speed up auto focusing, a lot. The only other positive I can see with the newer camera, for some people, is the inclusion of wi-fi for quick sharing. But God help you if you're trying to upload RAW files on a wi-fi connection....
In the plus column for the Nex7 is the robust construction, the Tri-Navi operational controls and the world's best low ISO 24 megapixel APS-C sensor (yes, I am biased).
I'm happy to see the simultaneous release of both the camera with kit lens and the camera as a body only product. A lot of people have Nex-7's and may want a back up. It would be a shame to have to buy another kit lens in that case. Too many other mirrorless camera companies seem to want to force their customers into buying kits if they want the opportunity to buy their cameras in the first few months after the introduction. Points to Sony for letting us go both ways.
My recommendation? Get the Nex6 body only, add the 19mm Sigma and the 30mm Sigma along with the Sony Nex 50mm 1.8 and you have yourself a lightweight, high performance kit with all primes. Expand from there.
If I were starting my Nex system from scratch right now I'd probably go with the Nex6. As I'm already half a year into using my Nex 7 I'm more inclined to have a second one as a back up so I can set them identically and go back and forth, using each with a different lens. Sometimes it's great not to have to stop and change lenses in a fast moving event or on a dusty day...