Aniket,
You may find this white board video interesting http://www.youtube.com/watch?v=RtaKOhsKKhM&sns=em
as it explains the details of the design concept in the changes to the data model in S/4HANA.
S/4HANA is not only a change from a database perspective, S/4HANA also offers functional SAP consultants plenty of of opportunities to use their existing knowledge and experience to shape business processes for their customers based on the new capabilities and simplifications in the actual data model.
thank you
erich