A local spokesperson for Google-owned Motorola would not confirm if the design-your-own 'Moto X' was coming down under but did say the following:
"Moto X is just the first device in a new portfolio of products that show the best of Motorola as a Google company.
"We have exciting plans for all regions, although we can't reveal specifics right now, this is just the start."
It appears Google are putting US, Canadian customers first, which is no surprise, since it is branding the new 4.7" Moto X with Touchless Control' and 'Active Display', as a 'Made in America" device.
We'll just have to watch this space.