Unfortunately, the full customization options in Moto Maker will only be available to Moto X customers in Brazil and Argentina, where some of Motorola's component factories are situated. Customers in other Latin American countries will most probably have fewer customization options at the initial launch of the Moto Maker service. Dennis Woodside made it clear that the Moto Maker might arrive to Europe as well. Again, it is yet to be revealed when that will happen.
You can catch Woodside's statements at the 7-minute mark.