Despite just releasing Lightroom 5, Adobe is doing a good one on those who haven't made the jump yet.
Adobe Photoshop Lightroom 4.4.1
The Adobe® Photoshop® Lightroom® 4.4.1 update includes these enhancements: • Correction that prevents artifacts from being introduced to Process Version 2003/2010 photos that have Fill Light adjustments applied. • Correction for raw image support for the Samsung NX300 camera. It is recommended that Samsung NX300 customers clear the Camera Raw cache (Lightroom-> Preferences -> File Handling -> Purge Cache) and rebuild their previews.