Autodesk Labs Project Spark is an experimental simplified Revit aimed at introducing BIM to new users. It could also be the Revit which gets seasoned AutoCAD users to try Revit. Bill is one of those who has:
William Le Couteur's Autocad Blog: Revit Spark
A while back I found that you could download a copy of a thing called SPARK.
This is a possible release of a different type of Revit.
Maybe you’d like to try Project Spark - http://labs.autodesk.com/utilities/spark/