We have never updated Maven central -- I think someone else, perhaps who is reading the forum, did that for 5.0.73. We should update it, but we don't quite have our act together on that. Hopefully we'll have more info on that soon, but for now you'll need to just copy the jar file or use the Oracle maven repo.
You should definitely read the release notes and the change log, and decide whether to upgrade.
BDB has both a commercial and an OSS license. Due to Oracle policy BDB does not have some of the things you might expect from an OSS project:
- bug system is not exposed
- roadmap is not published
- code contributions are fairly rare, mostly due to the nature of the code -- it's a database engine, and is fairly difficult to change casually.
What other questions about the process do you have? I wasn't sure exactly what you wanted to know.