You may have seen around that two new technology previews have been released around BIM. Project Spark is now available to try out. David Light has written a concise overview on his blog, Project Spark - quick overview.
Also, if you want to learn more about Project Spark at the up coming AU, Harlan Brumm, of Revit Clinic will be teaching a class on Spark at the conference. He will also be joined by the product manager for the technology preview.