I think Negreanu is one of those guys who takes care of his friends. Plus if you ever read his blog, he is fairly careful who he associates with. I would totally expect his friends like Cunningham, Lindgren, Harman, Ivey, Arieh, and Juanda to write something. Harman having written for SSII and Lindgren's own book coming out soon, they might not be associated with the book. Probably rule out other poker friends who have written books like Hellmuth. And any of the old school players won't be asked to contribute (Tomko, Reese, etc).

I would say darkhorse picks I would like is Fischman and Matusow. These are two guys who have something to contribute to poker, but probably not an entire book worth of unique material. If they tackled the heads up and online tournament portion, it would be awesome.