The upgrade is coming OTA and Motorola suggests that you have your handset set on Wi-Fi "to avoid large data charges". The company also recommends that you have your battery charged to at least 50% of capacity and have an active SIM card installed prior to downloading the upgrade. For more information, check out the source link.
One bug that won't be addressed with this upgrade is the problem that we reported yesterday with the phone's call quality. While earlier information made this problem appear to be widespread, Motorola released a statement that says the call quality problem is an issue affecting a small number of ATRIX 4G users and the company is already working on a solution for a future "maintenance release." Motorola also suggests that those who own an ATRIX 4G with a call quality problem should contact a customer support center.
source: Motorola via AndroidCentral
The upcoming software upgrade for the Motorola ATRIX 4G will fix many of the issues that users have been having with the device