It looks like a soak test has begun for the Motorola Atrix HD. Here's a snipped of the email invite:

We are inviting owners of the Motorola ATRIX HD on AT&T to participate in an early preview of a new software release, and provide feedback. If you are not currently using a Motorola ATRIX HD, please excuse and ignore this email.
There's no word on if this is a soak test for Jelly Bean on the device, but it is a distinct possibility. We will keep you posted.

Source: AtrixForums via TalkAndroid