Like the title says when?
Sorry, I don't think anyone knows...
Only thing I could suggest is maybe when RBN2.0 comes out (October 30th-ish).
Contact your local lawmakers and urge them to create laws that would be beneficial for Microsoft to extend their XNA sales platform into your country.
Then, when that has been taken care of, contact Microsoft and let them know that your country has made it easier for them to extend their XNA sales platform.
Yeah until XNA is available in a country then RBN can't be available there.
Not true :
Consumers in the United States, Canada, United Kingdom, France, Italy, Germany, Japan, Sweden, Singapore and Spain are able to download Xbox LIVE Indie Games for purchase. We are continually working to add additional regions.
Developers from which countries are able to sell their games? XNA Creators Club Online Premium members in Australia, Canada, Denmark, France, Ireland, Italy, Netherlands, New Zealand, Norway, Singapore, Spain, Sweden, Germany, Japan, United Kingdom, and the United States are able to sell their games. We are continually working to add additional regions, but these are the only countries were XNA Creators Club Online is enabled to pay their residents.
Now due to licensing issues only american companies can submit songs to RBN, but other countries outside of the US have XNA.