Nobody ever said anything to that effect. The only thing that was specified was the naming scheme for the first two GF100 cards.
That was the Fermi card vs the GTX 285. YouTube - GF100 (Fermi) vs GTX285 Farcry 2 BenchmarkSorry for everyone who thinks otherwise but 1 benchmark does exist.It is a direct comparison between a fermi card and an HD5870 running a Farcry 2 benchmark side by side and you can actually watch the two benchmarks and see the end results fermi 80 to 90FPS on this bench and the HD5870 50 to 60(around 60% advantage fermi and it looks better on the fermi card).I don't think Nvidia is being secretive because the cards are not good,they are being secretive because thats how they work.Nvidia almost never reveals much about their new products until launch time.The last time Nvidia started a product from the ground up it was the 8800's anyone remember how that turned out they smashed eveything.
That was the Fermi card vs the GTX 285. YouTube - GF100 (Fermi) vs GTX285 Farcry 2 Benchmark
Speculation as to the reason for jump may partially be because NVIDIA has already tagged some of its mobile DX10.1 products as GT 3XX; hence the usage of an entirely new "4xx" series would make it easier for users to differentiate between the new DX11 products and cause less consumer confusion.