With your fingers crossed! (use the IFC file format).
We have been trying this for quite a while now trying to get an ArchiCAD file into SPACEGASS translating the IFC file through Revit.
Really depends on what you need Revit to do, without translating much we were able to get the visual representation of the model, but that is about it - without properly translating the files from the IFC into revit and from ArchiCAD into the IFC it's quite difficult to get what you want.
Use ArchiCAD's linking software and that will be enough to get your model in.