Samsung is currently delivering a minor update for the Samsung Galaxy S III. The new firmware comes with the following versions; PDA: LF5 PHONE: LF5 CSC: LE4. An official changelog has yet to be released. However, early reports indicate minor bugfixes and small standby improvements.
Some have reported problems installing this update as an over the air update, forcing them to use Kies to update the software. I’d suggest that you try to update via Kies and make sure that you make a backup before proceeding with the update. The update is reportedly live in at least Sweden.