The Adobe® Photoshop® Lightroom® 4.1 update includes these enhancements:

• The ability to process HDR TIFF files. (16, 24 or 32-bit TIFF files)
• Additional Color Fringing corrections to help address chromatic aberration.
• Save photobooks created in the Book Module to JPEG
• Publishing photos to Adobe Revel is now accessible via a Publish plugin
• Additional camera support for several new cameras including the Canon EOS 5D Mark III, Fujifilm X-Pro1, Nikon D800, and Olympus OM-D E-M5.
• Corrections for issues introduced in previous versions of Lightroom.

See the Lightroom 4.1 ReadMe file for additional details.