I see no mention of a new jdbc driver on the release notes for Beta 1. Does that mean there isn't one?
Whose release notes? PostgreSQL Server? I don't believe the server release notes ever talk about external projects.
Its seems quite a few significant changes (including version numbering) have happened to the JDBC project in the past year but you will need to go directly to the project's site/GitHub to keep abreast of all of it.