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 What this also means is that Java 9 is obsolete and oracle will not provide any security updates for version 9.
This release includes the following twelve features and many smaller enhancements.
Local-Variable Type Inference
Consolidate the JDK Forest
Parallel Full GC for G1
Application Class-Data Sharing
Remove the Native-Header Generation Tool
Additional Unicode Language-Tag Extensions
Heap Allocation on Alternative Memory Devices
Experimental Java-Based JIT Compiler
Time-Based Release Versioning