Differences VC 6 (NetWeaver2004) and VC 7 (NetWeaver2004s)

Hi,

Is there a document/information that describes all the differences between the Visual Composer for SAP Portal 6 (NetWeaver2004) and the new version for SAP Portal 7 (NetWeaver2004s)?

I looked in several places but I haven't found a nice overview. Thanks in advance.

Best regards,

Eric