The firmware in this post is released for over 3 months. I'm using it already.
There is something new for ME865, Atrix 2 China Mainland version, recently. @司轩军, a PM at Motorola China, told us there will be a new OTA release for the device, and he is inviting people to help test the coming release. However, it seems that the OTA release is only available for two ME865 Chinese versions.
It is said the new release will adds some new features and bugfixes, includes call recording, camera and system stability improvements, and so on.
Here is an official post for inviting testers,