That's a joke, albeit a pretty funny one. There never was such a card as a Radeon x900, and there will never be. ATI has moved on to the Radeon X1K series.
Um, I dont think they were talking about the card series, but the GPU chip series. Though no mention of ATI was made, currently I believe it is the R600(?) GPU that is set to be released in august(?) on X1950(?) cards.