An article on Bloomberg set the internet ablaze last week when it suggested that tech giant Apple would finally be giving its iMac all-in-one desktop computer a well-deserved revamp this year.

“We wanted to do something that would express youthful optimism,” Miuccia Prada said after a high-spirited and newsy Prada men’s show that displayed some of the shrunken silhouettes, spunky colors and ...