JavaFX as of JDK 11 (the next LTS after JDK 8) is now part of OpenJDK. It's still released separately, rather than integrated like Swing is.

https://en.wikipedia.org/wiki/JavaFX

OpenJDK is now the 'official' JDK and reference implementation with Oracle making proprietary forks for their own customers, supported on their own timelines.

Java is actually doing some really interesting things since Java 9, with modular runtimes, pluggable garbage collectors, new compilers (Graal) and the Clojure crowd are being swept along with it simply by stint of being on the JVM.