Which features are you missing, specifically which file formats?
It is not a simple thing to list the differences between the two products as they have many differences, but Spotfire is evolving all the time. In fact, most of the DS features are already supported, and often existing features have been implemented in a more intuitive style. Although we cannot say when new features will arrive or what they will be, we have many customers who have already upgraded their DS installation to Spotfire and find it a more powerful and versatile platform for Analytics.
In addition to the JumpStart which Christof recommends, the latest product roadmap information will always be available on our website as soon as it is released.