In the light of the capabilities of HANA, there is a doubt among the SAP community about the sustenance / existence of BW.
The doubt cannot be ruled out because of the leverage of the HANA capabilities as an appliance as well as a back-end data base.
As the reporting can be done directly on the DATA in the database without the necessity of the INFOCUBE like structures, there is a very chance that entire BW or some of its components can become obsolete.