@vaskania : It was never possible to access the graph inside sbsar files.
So if I understand correctly, I must use Substance Designer 5 for my production work up until the point whhen Unity and Marmoset upgrade their software to recieve the new sbsar format from Designer 6?
@EArkham : I think you misunderstood the annoucement. SD can not and will not be able to reconstruct the graph from .sbsar files. One will only ever be able to edit the graph with .sbs files. What is new is that previously, only the .sbsar file where distributed on Source, now both the sbsar and the sbs can be available on Source. So if you want to access the graph of the substances you downloaded on Source, you need to download the corresponding .sbs files if it is available.
Sorry. If it is not available now, it will likely never be. We can only publish the sbs files for the substances that are created by Allegorithmic. Some are created by third parties, and we don't have the .sbs files for those.