Me thinks G70 is a renamed NV47 (of which they already had a bunch produced) and was considered good enough (and different enough) to be renamed in a completely different series. G71 (the short-rumored NV48) will be a revamp of this on 90nm with an unknown number of pipes while G80 is the old NV50. No scam here, just codename renaming and resorting.

I agree with other people here in saying that this was done because of ATi's delays.