Walter Isaacson is a great biographer. His Einstein and Benjamin Franklin biographies are amazing, definitely worth a read.
Since this is Isaacson's first biography of a living person, I'm really looking forward to reading the result. I guess it'll cover a lot of things we didn't know about Jobs and go even more in depth than his previous biographies have.
A lot of both positive and negative things can be said about Jobs, but no one can dispute that he is an interesting character with an astonishing record. November 21 can't come soon enough.