Nikon's sleek J1 and V1 models top the list of new cameras supported by the Lightroom 3.6 release candidate. Ditto for the parallel features in Adobe Photoshop Camera Raw 6.6 RC. Support also has been added for the Canon PowerShot S100, Panasonic Lumix DMC-GX1, and Samsung NX5.
Both RCs add profiles for about two dozen lens and fix a few minor bugs. For complete details, see Tom Hogarty's Lightroom Journal.
Release candidate versions have been poked and prodded by beta testers and represent the step before a final release, which generally happens about two weeks later. While RCs are betas, they're considered stable betas.