You've been able to buy an unlocked Moto G on amazon since not long after it came out. I assume the same will be true of its replacement.

You can buy it with either the US or worldwide GSM frequencies.

That's not true. It's being sold in Brazil [1] and if it's anything like previous the previous generation, probably a lot of other countries, too.

[1] http://www.androidpolice.com/2014/09/04/the-new-moto-g-leaks...

you can buy it in India. http://www.flipkart.com/motorola/newmotog

In some countries it's available, e.g. Switzerland https://www.digitec.ch/en/s1/brand/motorola-330