So, I was checking the official thread of Dark Souls in NeoGAF
a couple of days ago and the part with the collector's editions is kinda disappointing:
[NA] Collector's Edition consists of a metal case, and digital collectibles. It will include a digital download code for the soundtrack and limited edition artbook. It also includes a behind-the-scenes/making of video. The physical strategy guide has been replaced with a mini, digital version.
I'm still considering in buying it but the digital artbook part is a deal breaker for me, but I guess I'll wait for some unboxing videos on YouTube before going "fuck everything about this!" over this.
For Europe Namco has a nice collector edition though:
[PAL] Collector's Edition consists of a "digipak" cardboard case. This edition comes with physical goodies: a behind-the-scenes/making of video, artbook, soundtrack, and digital code for strategy guide.