This indeed a trivial thing, most trivial and utterly lacking in profits of a sane sort.
I do believe that the art that represents the back of the Opportunity cards, and the deck as a whole, has changed. While the Extraordinary Hat still adorns, and the dusty brown like the distressed leather of a well-bent book spine is the color to date, some kind of paisley or other pattern adorns the back beneath it in a subtle frosty emboss.
I do not recall seeing it before. Has my glass cephalus been clouded by the murk and must of this 'Neathy miasma?