ZK 6 RC is now officially released introducing users to generic enhancements, next generation data binding system, jQuery & CSS Style Server-side Selectors and many more.
For more details, please check out the
Release note http://www.zkoss.org/product/zk/releasenote/6.0.0-RC
New Features http://books.zkoss.org/wiki/Small_Talks/2011/November/ZK_6:_Upgrade_Notes
Download http://www.zkoss.org/download/zk