There's more...

There are quite a few other changes  introduced in JDK 18.9:

• The Java EE and CORBA modules are removed 
• JavaFX is separated and removed from the Java standard libraries
• The Pack200 and Unpack200 tools and the Pack200 API in util.jar are deprecated
• The Nashorn JavaScript engine, along with the JJS tool, are deprecated with the intent to remove them in the future
• The Java class file format is extended to support a new constant pool form, CONSTANT_Dynamic
• Aarch64 intrinsics are improved, with the implementation of new intrinsics for the java.lang.Math sin, cos, and log functions, on Aarch64 processorsJEP 309—Dynamic Class-File Constants
• Flight Recorder provides a low-overhead data-collection framework for troubleshooting both Java applications and the HotSpot JVM
• The Java launcher can now run a program supplied as a single file of Java source code, so these programs can run directly from the source
• A low-overhead heap profiling, providing a way to sample Java heap allocations, is accessible via JVM Tool Interface
• Transport Layer Security (TLS) 1.3 increases security and improves performance
• Support of Unicode version 10.0 in the java.lang.Character, java.lang.String, java.awt.font.NumericShaper, java.text.Bidi,java.text.BreakIterator, and java.text.Normalizer classes

Read the Java 11 (JDK 18.9) release notes for more details and other changes.