In all, there are three levels of specialness. For $80, you get a parchment map, a seven-piece dice set, replicas of the 40 "Destiny Cards" found in the game, a soundtrack, and DLC weapons that increase XP gained from "Fate Shift Kills." The $200 "Collector's Edition" adds the aforementioned troll and a concept art lithograph signed by Ken Rolston. This edition is limited to 700 units.
For the person who is really sure Reckoning is his or her jam (despite never having played it), there's the $275 Signature Edition. That has all the other stuff, but the troll is "signed by Todd McFarlane, R.A. Salvatore or Curt Schilling," and you get a custom sketch by Todd McFarlane. There are only 300 of these to hand out.
All three are available for pre-order here. If you're a really true fan, of course, you'll buy one of each. Just saying.