Autodesk released new version of IFC for Revit 2015 and 2016.
Users will benefit from the new import and export features as well as a number of bug fixes. These will give users more stable and expected output.
Availability? Autodesk App Store
IFC for Revit 2016 Version 16.3.0
IFC for Revit 2015 Version 15.6.0