Currently RichFaces has no TreeTable component, but other JSF component libraries like
Trinidad or ICEFaces support TreeTable. I just want to know whether there will be
TreeTable in the future components of RichFaces or not?
If you like tree table component you can vote for it here: http://www.jboss.org/community/docs/DOC-11862. Most voted components are periodically selected for implementation in the future versions