Lightroom 4.2 is now available as a Release Candidate on Adobe Labs.

What does it mean that it’s a Release Candidate? It means that it has been well tested and it’s almost ready for deployment, but it could benefit from additional feedback from the community.

The final release of Lightroom 4.2 may have additional corrections or camera support.

There are many bugs that were fixed in Lightroom 4.2 release. Here are just a few:

• Folder stacks with virtual copies get unstacked when moving to another folder,
• Stacked photos get hidden in both the Grid view and Filmstrip,
• Errors encountered when publishing videos to Facebook through the Facebook Publish Service,
• Unable to edit JPEG photos in Photoshop Elements,
• Certain book covers had spine text positioned in a Horizontal manner, not Vertical,
• Photos were exported with original GPS coordinates recorded by the camera, not with the GPS coordinates updated in Lightroom.

The entire list of bugs that were fixed can be found on Adobe Labs website.

There is a support for some new cameras as well:

• Canon EOS 650D / Rebel T4i
• Canon EOS M
• Fuji FinePix F800EXR
• Leaf Credo 40
• Leaf Credo 60
• Panasonic DMC-FZ200
• Panasonic DMC-G5
• Panasonic DMC-LX7
• Pentax K-30
• Sony DSC-RX100

All information can be found on Adobe Labs website.