Beaks!
Just after I expressed my wish to see little beaks at some point at the pileated nest, I did!
My husband and kids and I were taking my parents for a walk along the trail, and Mrs. P appeared.
She was there for a few minutes, then left. Mr P appeared then and went inside — briefly.
I’ve read that clutch size is typically 4 eggs, though it can vary. It’s likely that there are more youngsters in there.
I also read that adults have yellow eyes. This is true of the male, but the female’s eyes look pretty dark. But I’ll reserve judgment unless and until I get some better pictures.
This site is helpful on pileated woodpeckers.