So, on the solicit for Uncle Scrooge #34 (the 70th Anniversary one) it said that there would be "a long-lost member of the Clan McDuck" appearing in the story. They have released the A-Cover for the issue now, and it shows who the long-lost member is. It can be seen here: images-na.ssl-images-amazon.com/images/I/51AbwEtGyQL.jpg So, don't click there if you don't want to know, I suppose.