I blogged about SAP's High Performance Analytical Appliance (HANA) yesterday and someone followed up and sent me some very good inside information.  Apparently, Thomas Zurek, VP for R&D of SAP BW, wrote some good information on his SDN blog.  You can read it here: http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/21575.  Thomas talks about the relationship between BW and HANA and describes 4 possible scenarios of how the two will interact.  In the case of operational data marts, it is possible that HANA will replace BW.  However, in the case of an enterprise data warehouse, it is possible that BW will sit on top of HANA instead of another database like Oracle.  Definitely worth a read and doing some more thinking about the future of HANA.  I also like how Thomas is showing that the BOBJ BI tools as well as Excel will all be able to sit on top of HANA.  This goes back to what Vishal Sikka has said about HANA supporting open interfaces such as SQL and MDX.  I would also assume that other BI/reporting tools would also be able to connect to HANA.