IPF milestone 4.0.0 has been released! The artifacts are published and ready to download from Maven Central.
Note that this is the first official IPF release that requires Java 11. Also, it upgrades to use Camel 3.7. Documentation is available at http://oehf.github.io/ipf-docs/. Please have a look at the migration notes.
Many thanks to the IPF community for valuable input and discussions!