Update: A quick online search for the Dark Souls II Collector's Edition yields a standard price of $120 USD (or $119.99 to be exact). Amazon.com lists the Collector's Edition at $109. I should mention that no hard PC copy is being listed by any retailer currently; Amazon has an "online game code" entry.
Original (9/18): Tokyo Game Show is happening now, so of course we have news relating to Dark Souls II. The game will have both a limited and collector's edition, one of which won't cost extra.
The Limited Black Armor Edition can be acquired simply by pre-ordering Dark Souls II. Participating retailers (the usual crowd like GameStop and such) should automatically bump you up to the Black Armor Edition then, assuming they still have available copies. What this limited edition includes is both the game and soundtrack, not to mention really nice cover art (below).
If you've got money to burn, consider the Dark Souls II Collector's Edition instead. While no price has been named just yet, assume it'll cost a bit more than the standard $60. Included in this version are the full game, the game soundtrack, a cloth map, a small hardcover artbook, and a 12" statue featuring the default protagonist.
A new trailer and a bunch of new screenshots are also out today. The video is dubbed "Aching Bones," and features a bit of gameplay. Curiously, neither the images nor the trailer show a PC version of the Black Armor Edition or Collector's Edition, even though the game is obviously going to be on PC as well as consoles.
Aching Bones trailer - YouTube
Dark Souls II will be out on March 11, 2014 for Xbox 360, PS3, and PC.