This is a brief summary of some of the changes in the R2014 version of the IFC export for Revit project. Note that most of the changes in this project have been integrated into Revit 2013, so the changes center around moving more code to .NET and some cleaning up of the .NET code.
o Support for Revit LT 2014.
o Continued access to code: We've obsoleted more ExporterIFCUtils and moved more entity creation to .NET, allowing for greater customization abilities.
o Improvement of GUID creation utilities to prevent duplicate GUIDs from being accidentally created within an export.
o .NET wrappers for many remaining native classes to start migration to .NET of remaining native code.
We hope you enjoy these improvements and happy customization!