I have the latest update for ChinaRetail devices dated Aug 14th.
There's one more thread started by blisslove, but I'm not sure whether he will add more info or not.
So, this updates your kernel, bootloader, system files, etc, but won't upgrade cdt.bin (hooray!). What's new:
Bootloader version: 0A.76
System version: 67.213.6.XT910.en.CN
Baseband version: U_04.10.03P
Kernel version: 3.0.8-g6be9324
Build number: 6.7.2_GC-213-SPDU-6
Updated apps (patches for every single app, newer versions of Smart Actions, Email, etc).
Updated settings (e.g. Bluetooth ones).
Installation, rooting, etc:
1) First make sure you have 67.145.10.xt910.ChinaRetail.en.CN installed, cause this OTA is only for this version. If not, please install it via RSD Lite. For EMEA and LATAM devices' users: before flashing Chinese ROM (67.145.10) via RSD one should erase CID with the following commands (this will make you boot using BP Tools only till the end of the this guide):
su cat /dev/block/mmcblk1p18> /sdcard-ext/mmcblk1p18-back
fastboot erase cid
Hint: to restore your CID please type the following in Terminal Emulator:
su cat /sdcard-ext/mmcblk1p18-back> /dev/block/mmcblk1p18
2) Once you installed 67.145.10 please boot in Recovery and wipe data/cache.
Then boot, root your phone with any tool you like, install Voodoo OTA RootKeeper app (better to have apk beforehand, cause there are no Gapps in this ROM), make SU backup and temp unroot your device with this app. Don't install Gapps or do any modification in system.
3) Put OTA on your sdcard, reboot in Recovery and hit install from sdcard. Choose your OTA. Wait...
4) After successful installation (it'll take some time) you will have rooted 213-6 ChinaRetail. That's not all. Goto STOCK recovery and flash official Moto Gapps for Chinese firmware found here (I guess you need them). For EMEA and LATAM devices' users: then having booted again you most likely will have to set Custom init to ON for the 1st system in BootMenu Manager. This will let you boot as usual, without BP Tools.
There's no way to root the phone after installation of this OTA, but you can root previous version, that's why I suggest to use OTA RootKeeper.
Enjoy your latest system!