Twitter leaker Majin Bu, who is best known for leaking iPhone and iPad mini cases ahead of launches, has claimed that Apple is working on a “completely renewed” version of Messages to launch next year as part of iOS 17. It would be the first redesign of Messages since iOS 7. According to Bu, the redesign will accompany the release of Apple’s long-awaited AR headset. Previous rumors have said the headset will focus on “communication” as one of its central tenets. The iPhone will almost certainly be a major component of Apple’s headset and a redesigned Messages app would go a long way toward uni…