It seems ACIS support is not yet quite ready but IFC is the way forward! Not sure if Archicad 14 has built in IFC file support but this is just amazing! That’s exactly what I was looking for…from what I have seen so far the best option to import DWG 3d data in to Archicad is by exporting DWG 3d data from Autocad to IFC format (this option is available starting from Autocad Architecture 2008) and importing this IFC 3d data to Archicad…if you use Archicad version 13 then you will need to download this free add-on first from here
http://www.graphisoft.com/support/ifc/downloads/public/ install it and then you should be able to import not only Autocad 3d data but almost every architectural program presumably has this IFC file support…you can read about IFC support here
http://www.graphisoft.com/support/ifc/ …it is basically a neutral file format that makes it possible to exchange information between different disciplines and different softwares in the building industry…so Autodesk and Graphisoft and presumably Bentley and Nemetschek or other big players should be able to support this format…and really IFC 3d data import looks really good…the same as it was in Autocad…man…I’m impressed!