To address new camera compatibilities, Adobe has released a preliminary version of Camera Raw 4.6. It’s considered a release candidate (RC) which is considered a bit beyond beta in terms of internal testing. In addition to Camera Raw 4.6, DNG Converter 4.6 has also been released. People who have new cameras and wish to import those images into Lightroom 2.0 will need to use the DNG Converter until Lightroom is also updated.
The downloads are available from Adobe Labs.