unfortunately there are no plans for another 3.x release. RichFaces 3.3.3.Final announcement (http://in.relation.to/Bloggers/RichFaces333FinalIsReleased) says:
This is the latest and last release of the 3.3.X branch, from here on out the whole team will be focused on pushing RichFaces 4.0 releases out.
Please have a look on our Migration Guide 3.3.x - 4.x (http://community.jboss.org/wiki/RichFacesMigrationGuide33x-4xMigration).
thank you for this info.