One of the new core capabilities of Web Intelligence is the integration with the SAP BW environment, which means that we can connect to BEx queries as well as to BW OLAP cubes.
Since this topic is worth an entire book by itself, I suggest that you should start with the following links in order to get some well-informed and detailed information regarding this subject: http://scn.sap.com/community/bi-platform/businessobjects-bi-for-sap/blog/2013/06/09/sap-businessobjects-bi-4x-with-sap-bw-and-sap-bw-on-hana--latest-documents and http://scn.sap.com/docs/DOC-35444.