Oracle recently announced the availability of Oracle Database 12c release 2 (12.2) for on-premises servers.
https://www.performing-databases.com/en/2017/01/oracle-database-12-2-on-premises-release-dates/
Linux x86-64, Solaris SPARC and Solaris x86-64: 15-Mar-2017
Other supported platforms (Windows x86-64, IBM AIX on POWER, IBM Linux on System z, HP UX Itanium): Q2CY2017
Source:
MOS DOc ID 742060.1