Project Spark is a brand new technology preview. Okay I'll get it over with a Revit Lite, sort of.
From the site:
Project Spark is a technology preview of a simplified 3D building information modeling (BIM) solution. Using Project Spark, building professionals can create designs efficiently with real-world building objects, produce more reliable documentation faster, and share files with consultants using Revit or AutoCAD-based products.
Project Spark is not intended to support conceptual design, analysis, rendering, advanced collaboration, and API.
You can DOWNLOAD it now to check it out!
How about some screen captures?? Sure? This one is the most visually "obvious" or different from regular Revit.
Massing and the sample model in view:
Exporting and the sample model in view: