With Version 12.2.02 the release policy for Oracle database will change drastically. During his keynote at DOAG 2017 Datenbank Andy Mendelsohn (Executive Vice President for Database Server Technologies at Oracle) said, that there will be no Version 184.108.40.206 but instead Oracle will release a new database version every year and the version number will be the year. Now we got the announcement: The next database release will be 18 (due to the "Release Schedule of Current Database Releases (Doc ID 742060.1)"
This is nothing new because since 2016 this art of versioning is common for PSUs (Patch Set Updates) and Bundle Patches. The patch number is the date on which the patch set has been released, e.g. 161018 stands for the Bundle Patch from October 18th 2016. PSUs and BPs will be renamed as well into Release Updates (former BPs) and Release Update Revisions (PSUs). This change will take place immediate though the first RU / RUR should be available on July 18th 2017.