I have not heard of that.
Besides the physical appearance, when it comes to the difference between the "Developer Edition" and Retail or Moto Maker edition, the only difference is unlocking the bootloader on the Dev Edition doesn't void the warranty, but on the "non-Dev" it does void the warranty.
For the most part, Motorola gives the bootloader unlock code away for free on their web site, along with the instructions to unlock. The exception being in the case of a few carriers like ATT, Verizon and Republic Wireless, where for what appears to be carrier requirements, they do NOT give out the code.
If you have ATT, VZW or Republic Wireless, and have an X built in 2014, see the China Middle Man is back thread in the general section about getting a bootloader unlock code from the only way possible at this time. But yes, it does void the warranty