JSR 296: Swing application framework An API to define the basic structure of a typical Swing application, thereby eliminating lots of boilerplate code and providing a much-improved initial developer experience
But it was dropped from JDK 7, so Swing will still exist (in its current form, instead of an improved one) and you'll still be able to learn it
I worked 11 years for Sun Microsystems and unless things change with the Oracle acquisition the policy to EOL(End Of Life) a feature of a Software Product like SunOS, Solaris, SunView, OpenWindows, NeWS, CDE,Java, etc. was to announce it in the next release prior to its EOL, and typically they will offer an alternative to migrate and keep the EOLed feature for a while for backward compatibility.
I would think JSR-296 talks about some alternative for GUIs for Java applications that don't run in a container (JEE) although 90+% of clients in the enterprise run inside a web browser.