New Camera Support

Canon EOS 5D Mark III

Fixed Issues

The following issues have been fixed in the Lightroom 4.1 release candidate:

Lightroom 4 did not properly open external applications when using the “Edit In” functionality.
Point Curve adjustments made in Lightroom 3 have been restored.
Addressed performance issues in Lightroom 4, particularly when loading GPS track logs, using a secondary monitor, and the controls within the Develop module.
Ability to update DNG previews and metadata for more than 100 photos has been restored.
This update allows for improved viewing of subfolders and stacks in folders with a large number of photos.
It was possible that a layout of a saved book could be lost after quitting Lightroom 4.
http://www.dpreview.com/news/2012/03/29/Adobe-Lightroom-v41-release-candidate