Game is/was selling exclusively in the UK (it's seemingly sold out already), a Mjolnir Edition for Halo: The Master Chief Collection. This edition includes all the content from the £52.99 Limited Edition (steel book case, a book featuring all the maps in the game, and the DLC Grunt Funeral Skull).
But the star of the Mjolnir Edition is a 12 inch tall Master Chief statue, bumping the price of the collector's edition to £169.99.
Halo: The Master Chief Collection is coming to Xbox One in November 11 and maybe, some day,to PC.