Following "community testing" at the end of February, Adobe released the final versions of Lightroom 4.4 and Camera Raw 7.4 for Photoshop CS6.
Along with the demosiac algorithms for introduced with the release candidate, the final iteration adds support for FujiFilm cameras using the EXR sensor, as well as default white balance adjustments for Nikon DSLRs.
In addition, since the February candidate came out, 16 new cameras were added to the supported hardware list. A number of bugs were also fixed for both applications, a full list of which can be found on Adobe's website.
Adobe Lightroom 4.4 for Mac can be downloaded via the Photoshop CS6 update mechanism, or manually here. Camera Raw 7.4 can also be downloaded through Photoshop's update system, while those not yet upgraded to CS6 can use DNG Converter 7.4.
Lightroom 4 is available for $149 for new users, or $79 for those upgrading from a previous version.