If what I'm hearing/reading is true about PCIe 2.0. I'm glad I didn't wait for the new 9-series. P35 does not support PCIe 2.0, so that requires a new mobo. The only one coming from Intel is the X38, released around the same time as 9-series. Prices of both are going to be sky high, so it's not worth wasting the extra money on the inflated prices, and it's not worth waiting any longer than I have.
So to clarify, at least from what I've read, the PCIe 2.0 slot will be backwards compatible in allowing older cards to be ran (good if you can't afford a new card just yet and already have a PCIe 2.0 mobo), but PCIe 1.1 won't be able to run PCIe 2.0 (bad if you can't afford a new mobo and want a new series graphics card).
Most likely if that's true, AMD and Nvidia will release cards that can be ran on both slots. Look how long AGP lasted after it "died".