The Technical Preview for Office 2010 is now out and there are a lot of new BI related features in Excel.  On his blog, Chris Webb has a post describing these at: http://cwebbbi.spaces.live.com/blog/cns!7B84B0F2C239489A!4645.entry.  Worth looking at.  At Simba, we are looking at how Excel 2010 will work with SAP BW and Oracle OLAP.  When possible, I will blog more about this.