PC-SIG announced the PCI Express 3.0 standard has been delayed, the spec was originally slated for later this year but is now planned for sometime in 2010.
The new protocol would have enabled faster data rates (32Gigbits/second) and better (lower) power consumption. According to the PCI-SIG the new protocol is a bit more work than expected, but that is ok as, well apparently we do not even need it yet. You have to wonder about these new standards that keep getting delayed. After all USB 3.0 got dropped for now, SATA 6Gb/s had stability issues and now PCIe 3.0 is being pushed back.