Which Lenses R Supposed To Fit SD15; DC or DG?

Hi Guys, I'm just on Sigma, Japan's web site looking at their SD15 and lenses. But it doesn't directly say which lenses are designed for the camera, DC or DG. I'm guessing it's the DC because of the SD15's sensor size. Just wondering if someone can give me a heads-up.

I want to follow the SD's future development with a view to purchasing a later version as it progresses. I just bought the DP2s and am very impressed with it'image quality, and am now considering stepping up later to an SD model but would like to know which lenses I should be also lookling at to fit it.

Thanks.