I’ve just published Smack 4.2.0-alpha2 on Maven Central. Everyone who wants to look into which direction Smack is heading, and current Smack users eager to be prepared for the upcoming API changes are invited to test this version out. We are awaiting your feedback in the Smack Users forum.
More information about Smack 4.2 can be found in the Smack 4.2 Readme and Upgrade Guide.