Yesterday evening, AT&T began rolling out an update for the Motorola Atrix 4G. The update, v4.5.9.1, will bring the device up to Android 2.3/Gingerbread. The update is coming over-the-air (OTA), and rolling out in waves so don’t be worried if you don’t notice it queuing up right away.
Additionally, you will need to be running the stock Atrix build of Android. If you have rooted and flashed something different and still want to take this OTA update, you’ll have to flash back to stock.
[Motorola]

Great phone, gets even better with Android 2.3.