a lot of it stemming from kitty kelley, who of course wrote that unauthorized biography.d be her biological father. oprah's biological father wasn't vernon winfrey and kitty kelley found out who it was, didn't publish it in the biography and told oprah separately, that's who she's meeting. there are other rumors. kitty kelley spoke to the chicago "sun-times" and says she thinks it's oprah's half-sister, unknown half-sister. needless to say, it's going to be a huge show, like they all are. the 25th and final season. she's doing it shockingly. >> she's rock 'n' rolling. another big oprah secret. >>> everyone loves this guy, roger ebert. you know, famed and wonderful movie critic. back in 2006 he had a tough medical situation, thyroid and jaw cancer. literally not only took his voice but had to have massive surgery. apparently it's good news he saw the damage it had on his look but now they've built him a prosthetic chin to wear on camera. pretty painstaking process here because he just had his new show come back to pbs called "ebert at the movies." so in addition to the new

i don't know who could talk it right now. >> kitty kelley, "obra," a biography, her latest book. >>> a new book out by bloomsbury publishing. blur how to know what is true in the age of information overload. in your book one of the chapters is we have been here before. what does that mean? >> that means we've gone through this dislocation created by an expansion of information time and again throughout history. in fact, newspapers were born at such time when the printing press came into being and distributed information to people who never had the information about the people in the institutions to control the lives, and it took decades for the public and the industry of information sharing to develop what we call newspapers to create a basis on which people could find information they could trust, and we have gone through this time after time with each new major change in technology. we've gone through a period exactly like this. >> mr. rosensteil, y deneen "-- why the name "blur"? >> people confused. when information is in greater supply, knowledge is actually harder to create beca

. >> reporter: in a highly publicized but unauthorized biographer author kitty kelley wrote about her appeared here on "today." >> the hardest thing getting drawn into the secrets myself. >> reporter: with a life so exposed, what secret could possibly be left? >> oprah winfrey is a master of what she does. queen of all media and most powerful celebrity in the world. she knows what she's doing. >> reporter: emotional reunions have become a cornerstone of her show with this new tease seems different. >> i thought i'd seen it all, but this, my friends, is the miracle of all miracles. >> reporter: for "today" jeff rosen, nbc news, new york. >> now, oprah's last show airs in september, she may have a few more surprises. but right now we're just focused on this one. >> more surprises. you think? >> exactly. >>> up next, cures for the common cold. there are a few of them. what really works and what doesn't really work. all that and more right after these messages. and blur my vision. my eye doctor said there's great news for people with astigmatism. acuvue® oasys for astigmatism. he said it'