Hi Nagendra,
One major observation that I have made in the recent past about SCM 7.0 EHP2 and EHP3 is that there are few applications that actually run on NWBC. So, you would see them running on your browser with a light weight Netweaver based application. I assume that there is a great scope for traditional APO ABAPers to get into new object oriented advanced methods of development. For the sake of example, let us consider /SAPAPO/EBOPI as the transaction. If there is any change that has to be brought in, you would have to work on the BADIs relevant to NWBC.
Hope this helps
Babu Kilari