I'm pretty sure there have been threads about it in the past. For the most part IIRC these have been speculation that the book would turn out to be a compliation of the "tips from the pros" that Full Tilt sends out in emails. If so I'm not sure how good it will be. I know that Michael Craig who writes the
Full Tilt Blog has mentioned that he is editing it and either missed or barely made his deadline (you can search back thru the archives - I think he mentions it around mid-March during his coverage of FTOPS). I believe the book had already been delayed previously.