Word is out on the streets that NVIDIA's G92 and G98 will be PCI Express 2.0 graphics cards with DirectX 10.1 support and DisplayPort.
It is still unknown when we will see the first displays with Display Port but we expect to see them soonish. Samsung, LG, Benq and some other key players are still quiet on this but we've see some HDMI enabled displays floating around.
Intel will also support Display port in its next generation IGP scheduled for Q2 2008. Nvidia might even demonstrate the Display Port from its cards at IDF but this is a pure speculation at this time.