Yaiba: Ninja Gaiden Z will be getting a Special Edition at launch, with a few bonuses for early purchasers. Though it won't cost any extra, Tecmo Koei says it will be available in "limited supply," a move aimed at pushing early sales.
IGN reports that the bonuses include a Dark Horse comic book, original soundtrack, and Yaiba-themed DLC costumes for Ryu Hayabusa and Momiji in Dead or Alive 5 Ultimate. Those bonuses are available on both the PlayStation 3 and Xbox 360 versions, with the slight difference that the PS3 version includes the soundtrack as a voucher and the 360 has it on the disc itself.
Yaiba was recently delayed, very slightly, and it's now set to hit March 18. That announcement came paired with a digital issue of the Dark Horse comic to soften the blow, and the one coming with the Special Edition is just a printed version.