Previews/Diamond will have their own version of the Mezco One:12 Collective Hellboy. The Anung un Rama Edition will include some exclusive items, not available in the standard release, including 2 different heads (one with long horns), a sword & flaming sword, BPRD tank top, & the flaming crown. Removed from this release is one of Hellboys extra left fists, his revolver, and gun case.
It should be noted that the pre-orders for the original release has sold out in many places, so this is a good oppertunity to grab Hellboy. Pre-orders are currently open at Entertainment Earth, or it should be able to be ordered by any comic shop that uses Diamond Distribution.