So the 700 series looks to be less of a product refresh and just nVidia spreading out the performance tiers a bit. The 680 through the 660ti were pretty tight in performance so this makes a lot of sense. When rumors of a cut down GK110 surfaced I wondered how they were going to fit it into the naming scheme, this "partial refresh" allowed them to fit it in without further deviation. There really isn't much reason for them to change the whole lineup, except maybe to cleanup the naming scheme.
Wonder how long after the Radeon 8k series drops the GeForce 800 series will surface. They definitely made it harder for AMD to match/surpass their cards at each price/performance tier.