The Lightroom team has announced the availability of the release candidate for Lightroom 4.3. The release candidate is made available before the official release in order to get broader community testing and feedback. This contains support in the Develop module for the new HiDPI monitors (i.e. Apple’s Retina Display), bug fixes, support for new cameras, and new lens profiles.

If you don’t have one of the newer cameras or displays and are not adversely affected by these bugs, I would recommend waiting for the official release of 4.3 (which will also be a free update).

Here are the bug fixes and new cameras supported, as quoted from  Adobe’s Lightroom Journal:

Bugs Corrected in the Lightroom 4.3 Release Candidate

The following bugs that were part the Lightroom 4 releases have been corrected. The team appreciates the very detailed feedback the community has provided on Lightroom 4 and we’re excited to correct a number of issues experienced by our customers. These issues have been FIXED:

  • Unable to upload a large panorama to Adobe Revel via the Revel Publish Plugin
  • Unable to add a second photo to a page layout in a Book. This only occurred when the “Show Unused Photos” filter is selected in the filmstrip.
  • A photo can be flagged as both a “Pick” and “Reject” at the same time when using the Toolbar to apply flags
  • Using multiple fonts within the same text cell inside a Book can sometimes cause Lightroom to crash
  • Exposure becomes the active adjustment slider in the Basic panel (within Develop) when moving from image to image
  • Customers using Photoshop Elements 11 were unable to upgrade their catalogs in Lightroom 4
  • Custom Cell padding options in the Book Module reset in between Lightroom sessions
  • 1080p video files shot on iPhone 4S flicker on replay
  • Leaving the Book Module after using multiple text colors in the same text cell can sometimes cause the book to be lost.

New Camera Support in Lightroom 4.3 Release Candidates

  • Canon PowerShot S110
  • Canon PowerShot G15
  • Canon PowerShot SX50 HS
  • Casio Exilim EX-ZR1000
  • Casio Exilim EX-FC300S
  • Nikon D600 *
  • Olympus PEN E-PL5
  • Olympus PEN E-PM2
  • Olympus STYLUS XZ-2 iHS
  • Panasonic DMC-GH3
  • Pentax K-5 II
  • Pentax K-5 IIs
  • Pentax Q10

Go to Adobe Labs for more information and to download Lightroom 4.3 RC.

Adobe Camera Raw 7.3 RC is also available, with these same updates, here.