Below are the highlights:

• Real POJO support with meta data merging [ more ]
• New (X)HTML template tag syntaxes [ more ]
• Experimental Ajax support with DWR integration [ more ]
• Embedded element priorities [ more ]
• Strict pathinfo mapping [ more ]
• Deprecated CmfProperty and CmfValidation [ more ]
• Flowlink-specific datalinks [ more ]
• Mail queue support for authentication and SSL [ more ]
• Support for setting reflexive outputs and globalvars across submissions [ more ]
• Bug fixes [ more ]

You can read the full changelog for more details.