Well, that's just a rumor. GX2 wasn't a hot sell as Nvidia expected, due to high price (it's dropping in price at the moment) and small performance increase if you compare with 9800GTX (cheaper). GX2 OC versions is avaliable now.
9800 series are just a refeshment of the 8800 series. The next 9900 series is going to be then next gen chip, I bet it will be better. And can't wait to see the ATI/AMD R700 coming out, the rumor for the release date is in June or July as well. Oh man, this is going to be a video cards war between ATI/AMD vs. Nvidia.