JDK 13 is currently in Rampdown Phase 1 (RDP 1), is scheduled to enter Rampdown Phase 2 (RDP 2) in a little over one week (on July 18, 2019), and is tentatively scheduled for General Availability on September 17, 2019. What this means, of course, is that it's time to start thinking about JDK 14! This post references and summarizes some of the online resources related to JDK 14 that are starting to appear.
Project JDK 14
The main OpenJDK JDK 14 page is the best place to start when wishing to see an overview of the release and its progress. Besides a reference to its associated specification (JSR 389: "Java SE 14 Platform"), the only other information available on this page as of this writing is a simple "Status" paragraph that references development repositories and the JDK Enhancement Proposal (JEP) process.