JDK 10, the first release produced under the six-month rapid-cadence release model, is now Generally Available. What this also means is that Java 9 is obsolete and oracle will not provide any security updates for version 9.
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This release includes the following twelve features and many smaller enhancements.

Local-Variable Type Inference
Consolidate the JDK Forest
Garbage-Collector Interface
Parallel Full GC for G1
Application Class-Data Sharing
Thread-Local Handshakes
Remove the Native-Header Generation Tool
Additional Unicode Language-Tag Extensions
Heap Allocation on Alternative Memory Devices
Experimental Java-Based JIT Compiler
Root Certificates
Time-Based Release Versioning

“Keeping up with changes is the only way to stay calm.”
-Rushi