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Sigma has released Firmware Ver.1.03 for DP1, which can be downloaded from here. The new firmware adds ISO 50 support and now the Grid Display mode shows Display Icons.
The company offers the following advice in a Note about ISO 50:
This firmware upgrade provides users with the ability to capture images at low-noise levels. However, ISO 50 has a narrow dynamic range unlike the DP1's ISO 100 and above settings and therefore may blow out highlight detail such as brightness or high saturation areas. This means photographers need to work a bit more carefully.
To use the ISO 50 setting for the best results, Sigma advises its photographers to pay attention to the following points.
Please meter accurately when using ISO 50. The camera's built-in metering system will produce excellent results under most conditions. In high dynamic range settings, however, we advise using Spot metering and taking a reading of the brightest part of the image. You can then adjust the EV by one or two stops to account for the brightness of that object. We recommend using the Auto Bracketing function.