The first early draft of the Java API for JSON Binding (JSON-B) 1.0 is now available for you to review: https://jcp.org/aboutJava/communityprocess/edr/jsr367/index.html. As discussed below this is distinct from the Java API for JSON Processing (JSON-P) 1.1, which also recently published it's own first early draft. Like all early drafts for JSRs, the goal is to foster dialog, feedback and participation. Although it is just an early draft the thirty-five page specification document is actually fairly far along so providing useful feedback should be easy.
If these are ideas that interest you, now is the time to get involved with JSON-B and join other folks in the community that are already helping out. The JSON-B early draft gives special thanks to Olena Syrota, Oleg Tsal-Tsalko and the Ukraine JUG for their contributions even at this stage. These folks have helped us with feedback, community building as well as evangelizing.
There are many ways for you to get involved as always. You are always welcome to join the expert group proper via the JCP page for the specification. You can always simply join the discussion by subscribing to the JSON-B specification user alias. If you would rather participate as a group through your JUG you can do that easily via Adopt-a-JSR.