However what works are coming out of copyright depends on the country. In the United States, the Copyright Term Extension Act dictates that no published work will be part of the public domain until 2019 (and even then, there’s the potential for an extension). Duke Law School’s Center for the Study of the Public Domain explains that “[in] addition to lengthening the term, Congress also changed the law so that every creative work is automatically copyrighted, even if the author does nothing.”
As shown on the map, many countries have copyright ending either 50 or 70 years after a creator’s death. So for 2018, work by people who died in 1947 or 1967 is entering the public domain. Over at the Public Domain Review, you can check out a post on the Class of 2018, which includes surrealist René Magritte, occultist and painter Aleister Crowley, and painter and printmaker Pierre Bonnard.