Apple Intelligence is the marquee feature of iOS 18, and one of the biggest developments, a significant upgrade of the Siri smart assistant, may be facing possible delays, a new report claims.Apple iPhone 16 Pro: is a key feature of Apple Intelligence delayed?SOPA Images/LightRocket via Getty ImagesApple Inc.s long-promised overhaul for the Siri digital assistant is facing engineering problems and software bugs, threatening to postpone or limit its release, according to people with knowledge of the matter, Mark Gurman reports for Bloomberg.The upgraded Siri, designed to be more personal and understand context, is still coming but Apple is racing to finish the software, Gurman says. The result could be that some, though not all, features which were scheduled to land in April with iOS 18.4 could be postponed until the iOS 18.5 release expected in May or later.The more personal Siri is due to be achieved in different ways, including Siris capability to integrate with user data to improve answers to queries and a way for Siri to more precisely control a users apps.MORE FOR YOUApple didnt set a date for these improvements to arrive, but Gurman understands that the plan was to introduce them in April. This means that some of the most impressive capabilities could be held over, such as one demonstrated last June where Siri was able to locate a relatives flight and restaurant booking by scraping through emails and text messages.Gurman points out that the iOS 18.4 update, though not on general release until April, its thought, could arrive for developers in a matter of days. Another option on the table is including the features in the April release but having them turned off by default. In that scenario, Apple could then enable them automatically in the iOS 18.5 update, he says.For sure, Apple would rather delay than deliver something thats not working properly, especially when its such a central part of the iOS 18 promise. On the other hand, delaying something that was teased in June until 11 months later is not ideal.There are more Apple Intelligence features on their way, including email sorting for iPad and Mac, a new style of picture creation in Image Playground and more. Some of these are still expected to come in iOS 18.4 even if Siris upgrade is delayed.Exactly whats happening will become clearer as soon as the developer beta is released in the coming days.