This is Rumor Replay, a weekly column at 9to5Mac offering a quick rundown of the most recent Apple product rumors, with analysis and commentary. Today: Siri shake-ups, iOS 19 goals, C2 modem, and new Apple displays. Here are this weeks Apple rumors.Siri shake-ups at AppleEarlier today, Mark Gurman reported that Apple was making a major change to Siris leadership within the company.Siri will no longer be part of Apples AI team with ultimate leadership from John Giannandrea. Instead, Craig Federighi is now the top exec overseeing Siri.Even more significant, however, is that John Rockwell is being moved out of leading the Vision group to now own day-to-day management of Siri instead. As part of the shake-up, a second key Rockwell veteran is moving to the Siri teamjoining Kim Vorrath.My takeawaysThis is a major change for Apple. And while Mike Rockwell might seem like a surprising choice to lead Siri, there have been rumblings that the Vision Pro creator has for years been angling to see Siri fixed.Perhaps my biggest takeaway, which Ill flesh out in a separate article, is that Siri finally has the kind of top-tier Apple leader in charge of it that can help it thrive. Rockwell may not have an AI background, but tasking such a major internal leader with management of Siri shows Apple taking the assistant very seriously.iOS 19 redesign goalsOver the weekend, Mark Gurman reported on Apples internal efforts around the new iOS 19 design in his Power On newsletter.First, Apples apparent goals for iOS 19 involve making it simpler to use, faster to navigate and easier to learn. It will also need to be ready for upcoming new designs, such as next years foldable iPhone, and optimized for an era of AI assistants.The piece also mentions that top Apple executives say they are confident that users will love the new look and feel. My takeawaysiOS 19 sounds like its attempting something very difficult, but also important. It aims to make Apples software ready to serve modern and future needs while also offering a fresh level of simplicity and ease for users.Thats a very risky proposition in my mind, but one that could pay off big if Apple succeeds.Multiple new displays in the works, not just Studio DisplayMark Gurman wrote recently about Apple having a new Studio Display in the works. It will reportedly launch later this yearlikely alongside the M5 MacBook Proor else early next year.But Gurman also added that Apple has a second new display being developed. Its codename is J527 while the expected Studio Display 2 is J427. He writes: here are two possibilities: Apple is developing both and will choose one to launch, or its a second model with a different screen size or set of specifications.My takeawaysIm very much looking forward to grabbing a new Studio Display when it does arrive, but this second monitor in development is especially curious. The simplest answer is that its a new Pro Display XDR, but the J527 codename being so similar to that of the Studio Display makes that seem unlikely. I suspect Gurmans first guess is right, and Apple is still prototyping two different approaches for its next Studio Display but will only launch one.C2 coming to iPhone 18 Pro modelsAnalyst Jeff Pu shared this week that he expects Apples next generation 5G modemthe C2to arrive next year. Rather than launching the C2 in all devices, he believes Apple will include it in the high-end iPhone 18 Pro and 18 Pro Max.My takeawaysIm fairly skeptical of this rumor. Largely because I suspect Pu is basing his belief on a prior Bloomberg report about Apple bringing the C2 to higher-end iPhones. Theres nothing in that original report, though, about this happening to the exclusion of other iPhone models.Its certainly possible Apple will use its new in-house modems to differentiate iPhone models more than it has before. For example, putting the C1 in the entry iPhone 18, and C2 in the 18 Pro models. But right now, I dont think we have any solid evidence thats going to happen. Apple adding the C2 to the full iPhone 18 line seems a safer bet.What are your takeaways from this weeks Apple rumors? Let us know in the comments.Best iPhone accessoriesAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel