I was reading on Mark Rittman's blog that the new release of OBIEE now supports Oracle database OLAP Option.  This is great news.  We have been gaining a fair bit of traction with native Excel support for Oracle database OLAP Option using the MDX query language provider and it is great to have OBIEE support as well because this adds another interface to how you can work with your data in your Oracle database.  You can read more here: http://www.obieetalk.com/obiee-11115-and-oracle-olap-support.