On SCN, Michaela Pastor, has added a nice blog providing information about the new functionalities provided with SAP NetWeaver Business Warehouse 7.4. (The general”  and the “powered by SAP HANA” version of SAP BW)

This page is a serves as a great landing page for everyone who’s interested in SAP’s vision regarding the future (roadmap) of SAP BW and contains many useful links.

You can read all about the SAP BW roadmap (including SP releases and the deltas between them) here