The US Department of State has published precise details about the 2017 Diversity Visa lottery here (2 weeks after the registration period started).
Online registration for the DV 2017 Program began on October 1, 2015 and ends on Tuesday, November 3, 2015 at 12:00 noon, US Eastern Standard Time (EST).
The following countries are NOT eligible to apply for the lottery:
Bangladesh, Brazil, Canada, China (mainland-born), Colombia, Dominican Republic, Ecuador, El Salvador, Haiti, India, Jamaica, Mexico, Nigeria, Pakistan, Peru, Philippines, South Korea, United Kingdom (except Northern Ireland) and its dependent territories, and Vietnam. People born in Hong Kong SAR, Macau SAR, and Taiwan are eligible.
Even if you were born in one of the above countries, you may still be eligible if
(a) your spouse was born in a qualifying country; or
(b) you meet the requirements for claiming a parent's birth country.
Lottery entrants will find out if they are accepted on or after May 3, 2016.
As a "winner" of the lottery myself, 21 years ago, I encourage everyone who is eligible to apply as soon as possible. The odds may be long, but somebody has to win. Good luck!
Full details of DV-2017 are here and here.
More information about the Diversity Visa category generally is here and here.
Elaine Martin has been practising US and global immigration law since 1997. She is an immigrant herself (from Ireland), so has a special understanding of the legal and emotional challenges involved in relocating to a new country.