So I guess this is a thing and have not heard anything about it. According to the storepage it includes the below (did a search did not find anything):
Celebrate 10 years since the release of Warhammer 40,000: Space Marine with this new Anniversary Edition.
This Anniversary Edition of the game includes for the first time:
• The full soundtrack for the game
• Classic and brand new wallpapers
• The original manual (pdf)
• The Official Strategy Guide (pdf)
• Ringtone
• The Collector's Edition Artbook (pdf)
• Collectors cards (pdfs)
• The original launch trailer
The Anniversary Edition also includes the original main Space Marine game, along with all DLC released for the game:
• Chaos Unleashed Map Pack
• Dreadnought Assault DLC
• Iron Hand Veteran Chapter Pack DLC
• Death Guard Champion Chapter Pack DLC
• Golden Relic Bolter
• Golden Relic Chainsword
• Power Sword
• Blood Angels Veteran Armour Set
• Salamanders Veteran Armour Set
• Alpha Legion Champion Armour Set
• Legion of the Damned Armour Set
• Emperor's Elite Pack
• Traitor Legions Pack
Celebrate 10 years since the release of Warhammer 40,000: Space Marine with this new Anniversary Edition.
This Anniversary Edition of the game includes for the first time:
• The full soundtrack for the game
• Classic and brand new wallpapers
• The original manual (pdf)
• The Official Strategy Guide (pdf)
• Ringtone
• The Collector's Edition Artbook (pdf)
• Collectors cards (pdfs)
• The original launch trailer
The Anniversary Edition also includes the original main Space Marine game, along with all DLC released for the game:
• Chaos Unleashed Map Pack
• Dreadnought Assault DLC
• Iron Hand Veteran Chapter Pack DLC
• Death Guard Champion Chapter Pack DLC
• Golden Relic Bolter
• Golden Relic Chainsword
• Power Sword
• Blood Angels Veteran Armour Set
• Salamanders Veteran Armour Set
• Alpha Legion Champion Armour Set
• Legion of the Damned Armour Set
• Emperor's Elite Pack
• Traitor Legions Pack