Stock Official Galaxy S4 (GT-I9500/Exynos Octa) Firmware Collection
Here's the list of Exynos GT-I9500 firmwares will update when more will come!
List is sorted based on "Changelist" value, which means bigger changelist number == latest compiled code == latest version.
If you find any of the links broken, let me know, i will update the thread.
To flash this firmware files, download use latest Odin 3.07 (Flashing Program) Here
You will be able to get all the versions as soon as Samsung releases it at: GT-I9500 Firmware Repository Page from Samsung-Updates.com