Apple may soon introduce a new iPod shuffle, according to a purported Apple inventory listing. 9to5Mac has posted what are claimed to be prices and part numbers for new MacBooks, iMacs, and Mac Pros that Apple is expected to announce next week at its WWDC event. Alongside those machines are seven listings for the same item—labeled B67, seemingly with six color options—that the report says are “probably” iPod shuffles based…