Release Roadmap
Release 12.2:New releases would be annual and the version would be the last of the digits of the "release year." The release originally planned as 12.2.0.2 would now is release, and the release originally planned as 12.2.0.3 would be Release 19. Releases and treated as under the umbrella of 12.2 for Lifetime support purposes. The expectation is for Oracle Database, the last release ("Long Term support" release) for 12.2.
Translation:The new version will be released annually, and the version will be the last two digits of the release year. The originally planned version is 12.2.0.2 and will now release version 18, and the originally planned 12.2.3 version will be the 19th edition. The 18th and 19th editions will be supported for life under the umbrella of 12.2. The expectation is that Oracle database 19 is the last version of 12.2 ("long-term support" version).
Oracle Database Release Lifetime (document ID 742060.1)