Thank you. I just tried to read more about it but all I got from amazon.com was "We're sorry. Kindle Unlimited is not available in your country. Please stay tuned.".
http://www.amazon.com/gp/feature.html?docId=1002872331
Besides, there's always:
https://en.wikipedia.org/wiki/Kindle_Store#Kindle_Unlimited
http://ebookfriendly.com/kindle-unlimited-ebook-subscription...