I've seen 11g a couple of times now and on top of Essbase inegration there are a couple of other benefits:
1) Pivot views now act more like pivot tables in Excel.
2) They have added (at a price) a map function so you can view geograpic performance on a map basis.
3) Scorecarding is now easier and looks a lot better.
The main issue (for me) that is still outstanding is the lack of development on calculated items. Some will say that the likes of variance calculations should be completed within Essbase, which is fine, if you have essbase. Without it, it can be very difficult to calculate meaningful variances.