Take a look around and you'll find that Revit model data is being exported to other applications for many uses. And with the continued development of the Revit API more bi-directional interaction between Revit and other applications is becoming possible. Here is a short list of uses for which Revit model data is being exported. You'll find links to a few of the applications on my blog but there are getting to be too many options to keep up with.
Cost Estimating and Material Takeoffs
Rendering, Animation, and other Presentation
Facilities Management and Building Lifecycle
Energy Analyisis and Green Building Design
Rapid Model Prototyping
In short, architects are learning to Design, Illustrate, Manage, Analyze, Report, Simulate, Fabricate, Communicate, Estimate, and Educate smarter with Building Information Modeling.
The next things we might see:
ADA and Ergonomical Design Analysis
Feng Shui Analysis