I can't remember, what was respectively in the Phoenix's Price and Phoenix's Fate rooms. I though both were passwords for the broken wands and similar things, but the narration implies otherwise. I also wonder what will be in the Phoenix's Egg room. It can't be prophecies (which could otherwise be the obvious choice), and I don't think Dumbledore had the foresight to store frozen brains of wizards who died so that Harry could resurrect them.