Even though Lightroom 5 is now shipping, Adobe has just issued a minor update for Lightroom 4. It’s managed to sneak under the radar, with 2 little bug fixes:
• 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.