UK retailer Game has listed the contents of the Diablo 3 collector's edition, or as Blizzard is billing it, "The Ultimate Diablo 3 Experience." This obviously makes the standard edition a "subultimate" experience, which is almost as cool as the "submarine" experience, which involves buying the collector's edition for the sole purpose of taking bubble baths with the Diablo Skull figurine and the rest of its special contents:

• Diablo 3 PC/Mac Game
• Behind the scenes DVD and Blu-Ray Two Disc Set
• Collectors Edition Soundtrack
• The Art of Diablo 3
• Diablo Skull and 4GB USB Soulstone
• Diablo 3 Aesthetic Artifacts (in-game)
• World of Warcraft pet (in-game)
• Starcraft 2 Battlenet Portraits (in-game)

Buying the Diablo 3 collector's edition can also snag you four free months of World of Warcraft, if you've been a player since Oct. 18, at least. Game lists the Diablo 3 collector's edition at £69.99. No word yet on North American specifics, or if they're any different than the UK's.
[Thanks, Felipe!]