No, predictions about what other undiscovered evidence you’d expect to find about the past. In a way this is like astrophysics in that you can’t conduct experiments, but you can predict that X is correlated with Y. Come to think of it, paleontology...

For example, take the Shakespeare authorship controversy; you could create a hypothesis that say “Shakespeare was indeed the author of Hamlet”. A prediction from this might be, “if a manuscript of Hamlet were ever found it would be in Shakespeare’s handwriting”. Not a really good example to be sure, but just off the top of my head...