Oh, I think ISO 6400 is an illusion of the marketing dep., no doubt in order to sell cameras, but still, with a company with Nikon's reputation, it will be interesting to see what they actually come up with. FWIW the French magazine (Europe's largest photographic magazine according to themselves) Chasseur d'Images has for more than a year been pointing out that the more pixels on a given site, the better one can reduce noise in the final image. The reason being the added information a higher pixel count provides to the demosaicking algorithm.
Basically I think that with the small sensor P&S one should try to supply the sensor with as much light as possible to increase IQ. But when was the last time we saw a new P&S announced with a f1,4 or f2,0 lens? The early G-series from Canon had this kind of optics, but I suppose the demand for ever greater zoom ranges, smaller size and not-too-expensive cameras put an end to that.
I'm shooting with a GR II, but I would gladly pay for a f1,4 or even 1,2 lens on that camera if only Ricoh would make one.