I really think it makes no difference what build was sent to OEM's now, Windows evolves, the build changes with each update as as long as you're on the rtm branch you're good to go. The release on the 29th will just be the same as everyone is running now with the Windows updates we will of all already downloaded at the time so there will be no need to reinstall/upgrade as some are suspecting.
There are three versions about Chinese: zh-CN (Simplified) zh-HK (Traditional) zh-TW (Traditional) X20-08972 SW DVD5 NTRL Win 10 64Bit ChnSimp PRO .iso is zh-CN.