JDK 11 is now in Rampdown Phase one
The overall feature set is frozen. No further JEPs will be targeted to this release.We’ve forked the main-line source repository, jdk/jdk, to the jdk/jdk11 stabilization repository. Any changes pushed to jdk/jdk or jdk/client are now bound for JDK 12.

• For more details , see Mark Reinhold's email to jdk-dev mailing list [1] 
• The Rampdown Phase one process  [2].

• 181: Nest-Based Access Control
• 315: Improve Aarch64 Intrinsics
• 330: Launch Single-File Source-Code Programs
• 331: Low-Overhead Heap Profiling
• 332: Transport Layer Security (TLS) 1.3
• 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
• 335: Deprecate the Nashorn JavaScript Engine
• 336: Deprecate the Pack200 Tools and API

Other important changes since last email:

Build 19:
JDK-8205043 : G1 enables adaptive parallel reference processing by default
Build 18:
JDK-8196141 : Add GoDaddy root certificates
JDK-8204243 : remove Thread.destroy() and Thread.stop(Throwable)
JDK-8202088 : Japanese New Era Implementation
Build 17:
JDK-8189949 : Remove Baltimore Cybertrust Code Signing CA
JDK-8191031 : Remove several Symantec Root CAs
JDK-8072996 : Deprecate stream-based GSSContext methods
Build 16:
JDK-8191844 : Remove SECOM root