the whining noise that users have been hearing when using earphones. Another interesting problem that this update addresses is one in which the Motorola DROID BIONIC powers itself back on after being turned off.
This update might have to do with the project that certain owners of the device were asked to get involved in last month by Motorola. The manufacturer often asks for willing participants to conduct a soak test before disseminating an update to all users of a specific model. While the update is imminent, don't jump off a roof if you don't have it yet. Not everyone will receive it at once as the OTA update gets rolled out in waves.
For a complete list of changes, visit the sourcelink.
source: Verizon via AndroidCentral