The official details state:
Android Version: 4.2.2 – Build JDQ39
Build Date: April 24
The more interesting aspect of the file is the build date only being yesterday. This makes it the most current build of the firmware out there. If you want to get your hands on the current firmware for the Chinese Galaxy S4, point your browser to SamMobile’s Firmware page. You will need to be registered with them to pick it up though. Happy tinkering!
On a side note, this will be the Exynos based variety of the device, not the Qualcomm version the states will be getting.