Hi Ajeet,
There are many options or ways to improve your BI landscape by HANA.
1. ERP on anydb -> BW on HANA: your query results will improve 20-100 times upon scenario. However data extraction will only improve apprx 20% if you have standard extraction, but DSO activation will improve dramatically, thanks to coloumn store and HANA optimized re-design of fact and dim tables.Also you can replicate data table to table from ERP to BW with no latency by SLT
2. ERP on HANA -> BW on HANA : Addition to all improvements in 1st option you have chance get real time data without replication, by using analitic and calculation views. Simply creating a remote cube based on HANA views.
Just make a quick search in googe "BW on HANA" or goto SAP BW Powered by SAP HANA space
Cheers,
sarhan