The revelation came in an interview with Brazilian television yesterday, and The Next Web highlights Isaacson's comments about holding back the information because it would have been "unfair to Apple" to share it before the company's plans were publicly known.
[Isaacson] says that he left a few things out of the book, one of those being details of "what [Steve Jobs] thought the next Apple TV should be."
He says that he left it out of the book "because Apple hadn't yet done it and I thought that, maybe, that was unfair to Apple before they produce the TV...reporting what Steve thought it should be."
Article Link: Steve Jobs' Biographer Left Out Details on Vision for 'Next Apple TV'