Today exactly 2 years after JSR 363 went Final, the Java Community Process published the Early Draft Release of JSR 385 for Review:
https://jcp.org/aboutJava/communityprocess/edr/jsr385/index.html.

Corresponding GitHub release tags for the API:
https://github.com/unitsofmeasurement/unit-api/releases/tag/2.0-EDR
For the RI:
https://github.com/unitsofmeasurement/indriya/releases/tag/2.0-EDR
And for the TCK:
https://github.com/unitsofmeasurement/unit-tck/releases/tag/2.0-EDR