We still don't have any official information on the Hardened Edition of Call of Duty: Modern Warfare 3 , but maybe this will help.
It seems Wired has stumbled across an image that shows off the contents of that special edition. Apparently, this is for the European version, and it includes a one-year premium membership in the Call of Duty Elite initiative, which in turn grants you a "Founder" status label. This comes with an emblem, player card, camo, an an XP boost for your Elite clan.
Other standard bonuses apply: the steelbook case, new disc art, a PSN-exclusive theme or Xbox 360-exclusive "Special Ops Juggernaut" avatar outfit, and a field journal that stretches 100 pages in length. Now, this may be bogus or US gamers could get something very different, but it's always nice to check out the possibilities…
Related Game(s): Call of Duty: Modern Warfare 3