Motorola already has had to delay the option that it planned to give users of the Moto Maker, to add a digitally printed line to the back of the phone. Moto X buyers could have added their name, web address, or a brief message to the phone being personalized on the web site. Motorola now says that this option will be "added in the future".
Motorola also added that the standardized version of the phone in black and white, will be available from its other carrier partners "within days". Later this year, Verizon customers are expected to also have the option of using the Moto Maker to customize their Moto X.
source: Motorola via AndroidCentral