Good find!Its possible its not, but the artwork makes it look like its a steelbook, there's an Amazon UK exclusive with 4K, 3D & 2D.
https://www.amazon.co.uk/gp/product/B074WBLVH8/?tag=hidefnin-21
It's not listed currently as a steelbook, but I've just had the following response from Amazon to my enquiry in that regard:Not a steelbook, but Amazon are doing a combined 4K and 3D version.
I may give a try if that's the final art with gloss and deboss/embossImages taken from a Dutch retailer - looks like the final product for the 3D steelbook
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For me it does not make a different given that art.No front title
UK has 2 Steelbooks and artwork same as USAReminds me of the Age Of Ultron design.
Is this another UK exclusive?