Android 4.4 is the latest Google Android OS that currently only available for Nexus 5 and will available update for more other Android smartphones soon. Android 4.4 features with Faster Multitasking, Hangouts 2.0, Smart Caller ID,Screen recording, Built in support for IR blasters and more!
Here, the latest CM11 AOSP ROM which is base on the Android 4.4 Kitkat is now available for download. According to the developer, Temasek said that this- Android 4.4 KitKat CM11 AOSP ROM is an UNOFFICIAL build of CM11 ( CyanogenMod 11 ) for i9300. If you are interest and want to try this latest Android 4.4 Kitkat custom ROM, the you can download the ROM and manual flash into your Galaxy S3 via Odin. Before you try this custom ROM, you can refer link here for the tips and info on install custom ROM for Galaxy S3. Besides this, you also need understand that f lash or modified Galaxy S3 Snapdragon firmware will void the phone warranty. This Android 4.4 KitKat CM11 AOSP ROM only support Galaxy S3 Model GTi9300.
Download Android 4.4 KitKat CM11 AOSP ROM For Galaxy S3: Link (XDA source)