Recently, I've been hearing a lot about upcoming major changes in the PC industry - 64-bit processing, new PCI versions, updated video cards, etc... I'm a pretty dedicated gamer, and I'm usually up to date, but right now I'm very lost.

What I'm most interested in is the videocard industry. I read somewhere that once the new PCI version comes around, both ATI and nVidia will release new cards designed for this new interface, faster and better than the current top of the line models. I have also heard that they will be releasing an adapter for older PCI versions (although I don't really see how that's possible). My question is, should I buy an Ati Radeon 9800 XT now, or wait for a while before the new cards come out? For all I know, they could be designed not for gaming but for something else - I am completely ignorant on the subject.

Also, what are some good websites/publications that talk about such breakthroughs?