The update brings many S4 features to the last year's flagship device including an array of lock screen widgets and unlock effects, a new driving mode, updated version of S Voice Assistant app, new display modes and a re-tooled quick settings area in the notification pull-down. The features like hovering are not included as they are hardware dependent and thus won't work in Galaxy SIII.
If you want to try it out on your Galaxy SIII then go ahead and download the file. You must understand that there are risks involved in this and you really must what you are doing. If anyone of you happens to update the phone to the latest android version do let us know how's it working. It's a very pre-release version and will have many bugs. But there might be few among you who will give it a try. Check the source below to download the file.
Source: SamMobile