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It's faster than a GeForce GTX 580, cheaper, uses less power, and has a better feature set. Even if you didn't think the 7970 made the GTX 580 irrelevant, the 7950 certainly does, at least at current prices. For Nvidia, Kepler can't arrive soon enough.
AMD is still charging quite a lot for their Tahiti cards, and cheaper than a GTX 580 is not the same thing as cheap. I'd expect to see prices drop a bit once they can more reliably keep them in stock. But just a bit, unless GK104 manages to start a good price war. Which it might, as rumors seem to be pretty bullish on GK104 performance.
Further down the line, Pitcairn should be coming soon, and then Cape Verde. For laptops, I'd expect to see Pitcairn and Cape Verde show up, but not Tahiti. I'm not sure if Nvidia will try to cram GK104 into a laptop, but even if not, lower end Kepler cards may finally make Nvidia competitive in laptops again, as they haven't been for two years.