ComputerWorld's J.R. Raphael:According to
So far, there is no word on when the engraving will make a comeback, but Motorola apparently hopes it will be "soon". There is also no word on whether or not this has anything to do with the list of banned words in the Moto Maker blacklist. If you hadn't heard, early testers have reported that the Moto Maker tool will not allow you to use words like "Apple", "Samsung", "Google", or "DROID". But, the tool had no problems with words like "iOS", "iPhone", or "Facebook".
Curious, indeed. We'll let you know more when we find out.
source: +JR Raphael
reference: The Verge