DVI hasn't even been fully adopted and we are in for a replacement already. What's the need for that? Monitors are still being sold with the aging (analog) VGA connectors, why another change so fast? Basically, because of resolutions.
A single-link DVI connection has enough bandwidth to display resolutions up to 1920x1200 at 60Hz. To get more, dual-link DVI was introduced. That way we can go all the way up to 2560x1600 at 60Hz. The problem is that this is as much as the technology will allow, it can't be updated anymore.
The current generation of DisplayPort reaches 2560x2048 at 60Hz (single connector) and it could be improved to 3840x2400 at 60Hz in 2008-2009 (revision 2).
Furthermore, DisplayPort is a single standard to both graphics cards and internal connections in notebooks. It's also smaller and easier to plug.
Link: bit-tech.
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