Samsung Galaxy S4 Android 4.3 Update Leaks, Coming Soon
The folks at SamMobile are floating the leaked code, which it claims is "one of the final builds," meaning that no more features will be added or taken away in future releases. All that will be adjusted in future releases are bug fixes and other minor tweaks.
Citing unnamed sources, SamMobile says Samsung will begin dishing up the final and official Android 4.3 build to Galaxy S4 owners within the next couple of weeks. That could depend on your wireless carrier as well, though at least you know it's coming (assuming the sources are solid).
Meanwhile, we're still waiting on Android 4.4 KitKat to make an appearance, which is likely to be debut on the Nexus 5 rumored to be announced later this month.