Samsung Galaxy S3 GT-I9300 started receiving Official Stock Android 4.3 update in India with the build number I9300XWUGML4. The first official bug fixed Android 4.3 was released a month before this release in the US and some other regions. The features included in this release are same as the US Android 4.3 version. As we stated in the older post the Core UI is totally revamped and look almost like Galaxy S4, Note 3 etc. Even the lowest budget device like Galaxy Duos 2 with Android 4.2.2 has the S4 like the latest weather widget, Samsung hasn't included that most expected one in this update.
Along with UI change the update also has improved performance, new camera modes, improved battery, App to SD support, etc. See the list below for complete set of features available in this latest update.
Galaxy S3 Android 4.3 Change Log.Check out Here
Currently the update is available via OTA and may available through Kies too. If none of them works download the from any of the link below and follow the guide in the provided link.
1. Download the latest Android 4.3 for Galaxy S3 I9300 India
SamMobile Or Samsung-updates
2. Follow the method provided in the post below.
Galaxy S3 GT-I9300 Official Stock Android 4.3 Update Using Odin