When is Google Music going to be available outside US?

The question is very simple and straightforward: I live in Australia, and I would really want to try out Google Music on my Android device, but sadly, it's currently only available in the US.

I know it takes a lot of time to be able to distribute contents in another country. There are regulation barriers, building partnership with local music companies, etc. But I would truly like to see it happen in other counties in the near future.

SO, Does anyone know when it might be available to the outside world?