Source in case someone is willing to translate : 4gamer.net, the screen shot below taken from here.
The 700 series skipping the 600 series is just a rumor. It's base on a circulating benchmark that shows that the GTX 780 is twice as good as the GTX 580.
Source: Tweektown (Dated around 12/16-12/18/11)
Rumored GTX 780 spec (From VideoCardz.com , December 2011)
So, it looks like the Radeon 7000 series is gonna win the market the first half of 2012 and GeForce in the 2nd half of 2012, I mean for the gamers.