Both AutoCAD 360 and the new Fusion 360 3D modeler will be available for real-time drawing and editing of drawings and models inside the GrabCAD Workbench environment.
If you are still saying the "cloud" won't happen, it's really about time to stop :-) Cloud is coming, it's here, it's happened!
GrabCAD currently has about 700,000 members; they will top the million mark very quickly thanks to this new partnership.
While this is very big news for GrabCAD I must admit I'm more than slightly disappointed they've gone the Autodesk only way. Despite what Autodesk marketing might say there is more to 3D/CAD/AEC than just Autodesk products.