David Farkas Photography Blog has some of the best Photokina coverage around. His latest post has excellent photos of and commentary regarding the Leica D-LUX 4 system. I found the following statement regarding the D-LUX 4 to be of particular interest:

The camera ships with Capture One v4 software which allows RAW file processing. Interestingly, the Panasonic LX3’s RAW files are actually different and are not supported in C1. So, the differences go beyond skin deep between these compact camera cousins.

If true, this would be the first time that a Panasonic product were to differ at the RAW level from the Leica version of the same product. It's remains to be seen whether there are such substantive differences. Perhaps a simple camera name change in the EXIF will be all that it takes to get LX3 support in C1.

At any rate, when choosing between a D-LUX 4 and LX3, don't forget to factor in the longer warranty, included RAW software, and higher resale value of the Leica product.

Source: David Farkas Photography Blog - Photokina 2008 - Day 5 - Gitzo, Manfrotto, Lastolite, and Leica compacts revisted