Moderator Committee Lead / RC-RT Committee / Spider-Mod
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No one knows. Only lists you will find are approximations for international versions. It will be months after that for the carriers to release it.
And the carriers have the final say on whether your device gets it.
This same question is asked every time a new version of OS is released
The only reason 4.3 was pushed to everyone was for Galaxy Gear compatibility before the holidays.