That Samsung was going to upgrade the Galaxy S4 latest version of Android was granted, but, not having the company released any official statement, we could not (and still can not) tell you about an exact date. Today, however, for the more technically inclined users, the well-known magazine SamMobile managed to get the firmware of Android 4.3 for the Galaxy S4 own and make it available for download.
As always in these cases, we do not know if that firmware is the final one or not, but it is certainly very complete. There is the possibility that the Korean triggers the roll-out of the update within two weeks from now, then, with a few corrections and adjustments here and there, we imagine that the update that will be released will not differ that much from the leaked firmware today.
Here is the link to the download page . Do not forget to let us know how you think this new version of Android on your S4!
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