Going back to this upcoming book, this may just be the most definitive biography yet, based on the official synopsis:
In a groundbreaking biography that draws on unprecedented access to Springsteen and those closest to him, acclaimed music critic Peter Ames Carlin presents the most revealing account yet of New Jersey’s favorite son. With contributions from band members past and present, including the last interview given by legendary saxophonist Clarence Clemons, Bruce encompasses the breadth of Springsteen’s astonishing career and explores the inner workings of an American icon right up through his most recent sold-out tour and #1 album, Wrecking Ball.
- copyright (c), Simon & Schuster
Apparently the author also gained access to the Thrill Hill vaults, and got stuff very few outside the band has heard or seen. This should be a very good read [link]. Also, look out for two anticipated autobiographies released later this year -- Waging Heavy Peace by Neil Young and Who I Am by Pete Townshend. Other music autobiographies currently out are those by Buddy Guy, Gregg Allman, Johnny Ramone and Carole King.