Apple may shake up the next version of iOS with the introduction of a true mobile wallet, forecasts Morgan Stanley analyst Katy Huberty. Dubbed a “killer app” by the analyst, the mobile wallet feature would surface as part of iOS 7, which Apple is expected to preview at its Worldwide Developers Conference in June. Huberty’s prediction echoes that of fellow Apple analyst Gene Munster, who also thinks a digital wallet is in Apple’s future. However, Munster believes the technology won’t surface on iOS devices for another year or two. Apple got its feet wet in this area last year with the introduction of Passbook. But Passbook is not a true digital wallet that would enable you to pay for items directly through your phone. Instead, Passbook allows you to store digital coupons, which you can sync with a membership card at retailers such as Starbucks to pay for items.