Amazon Germany updated their description with new pictures. Their steelbook looks like this now:
http://ecx.images-amazon.com/images/...L._SL1500_.jpg (With Knight's Endurance DLC)
Former:
https://farm8.staticflickr.com/7552/...0bdc7f70_o.jpg
So their are three steelbooks around iirc. The other ones are with Limited Steelbook Edition with Knight's Arsenal DLC (
http://www.gameware.at/static-ap/Gam.../P4-THORSE.jpg) and the steelbook in US Collectors and Premium Edition. Anything else?