I would have to mostly agree with Jerryrock. Although I love the concept of the DP1 with its big sensor, it appears to me that the bigger sensor requires bigger optics, and they had to make compromises (f/4, fixed focal length) in order to make it more 'pocketable.' If they were less worried about its pocketability, I'm sure the optics would be a priority for improvement. Sure, you can use the optional adapters for a little more telephoto, but due to the decisions about the optics there are clearly limitations on where this camera would be useful. The CCDs in pocket cameras are reaching their limitations with current architecture, but Image stabilization helps reduce the need for higher ISOs with static and slower subjects. There is some legitimacy to go for smaller sensors in order to get the most out of limited space... but to get quality up to where I believe it should be in small sensor cameras, technical designers really need to move onto CMOS designs with panchromatic filters.
The bottom line is that I find the fixed focal, slow wide angle lens to be somewhat of a deal breaker, because I would be limited to the subjects I can walk right up to in decent light. Having to resort to high ISO on a Foveon sensor is not desireable, and if one had to crop as a result of the focal length, the aliasing of fine detail in the Foveon image would be too pronounced in the final print. I'll pass on the DP1, but I look forward to the DP2... hopefully it has image stabilization.