List gives no indication of when updates will actually begin rolling out
Motorola was quick to refresh its software support page to indicate which devices are set to receive Android 4.4, and it has just updated the page again with six more devices. Verizon and Motorola's 2012 Droid lineup are the big new additions, including the Droid RAZR M (branded and Dev Edition), RAZR HD and RAZR MAXX HD.
Interestingly, Motorola's support page is also now indicating that AT&T's Atrix HD will also be updated to Android 4.4, along with the U.S. Cellular Electrify M. They join the ranks of the Droid RAZR HD Developer Edition, the full lineup of 2013 Droid phones and of course Moto X variants on the Android 4.4 update path.
As is typical with these changes to the software support page, there's no indication as to when the updates will be making their way out, but simply knowing that as of now Motorola plans to update the devices is good. Naturally we'll have a better indication of when the device will receive the updates officially as the process moves along.
Source: Motorola; Thanks, Ryan!