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Oracle Database 12.2 is now available on select platforms!: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
Instant Client is similarly available e.g. on Linux x64 http://www.oracle.com/technetwork/topics/linuxx86-64soft-092277.html
This release of Instant Client adds Data Pump & SQL*Loader to the 'Tools' package.
OCI new features are in the OCI doc: http://docs.oracle.com/database/122/LNOCI/release-changes.htm#LNOCI005 (Database-side new features are listed in http://docs.oracle.com/database/122/NEWFT/toc.htm)