Perhaps the biggest surprise is that the Motorola ATRIX HD will be jumping from Android 4.1 to 4.4. Additionally, the U.S.Cellular branded Motorola ELECTRIFY M will also be making the same jump.
Other Motorola models getting Android 4.4 now include the Motorola DROID RAZR HD Developer Edition, the Motorola DROID Ultra, Motorola DROID MAXX and Motorola DROID Mini, and all versions of the Motorola Moto X. The Motorola Moto G will launch in the U.S.with Android 4.4 installed out of the box.
No word on when all of these updates will get rolled out. Right now, the Verizon branded Moto X is in the midst of a soak test that will soon bring Android 4.4 to the phone.
source: Motorola via AndroidCentral