AT&T announced on their Consumer Blog the availability of Android 4.1 Jelly Bean for the Motorola ATRIX HD. The update follows the release last week of a Jelly Bean update for Samsung Galaxy S III devices. The Motorola ATRIX HD joins the Galaxy S III, the Samsung Galaxy Note II and the HTC One X+ as devices in the AT&T portfolio boasting Jelly Bean.
The update is available as an over-the-air (OTA) update via Wi-Fi. Users can can get the update by going to Settings -> About -> Phone -> Software Updates on their device.
source: AT&T Consumer Blog