The two favorite creations of mine ever, Old Glory and the Savant are not absent from Dark Future.
That's right, you've seen them as the best of friends, in the WWII-era supplements for Supers20 (found in the Modern Dispatch), you've seen them and the agencies they lead as the worst of enemies, in the modern era in the USHER Dossiers campaign model in the Supers20 core rules and in Dark Future you'll get to see how these complex characters continue to interact.
I'm going to be a tease here and not actually give it away. But I will say that, those familiar with the characters should be interested (and hopefully pleased) at the next part of the tale. As you may know, Old Glory is more or less immortal and it was the Savant's mortality that caused the rift between the two in the modern era.
With Dark Future taking place in the near future, which would make the Savant roughly 100 years old, his mortality will again play a part.