Hi Akshat,
SAP NetWeaver 7.4 has now been made generally available (GA) to SAP customers ( http://scn.sap.com/community/netweaver/blog/2013/05/10/sap-netweaver-74-made-generally-available-ga ).
You can find an overview on how to use Database Procedure Proxies here: http://scn.sap.com/community/abap/eclipse/blog/2013/05/12/consuming-existing-hana-artifacts-in-abap-is-easy .
Regards
Chris