Apple internal tests iOS 18.4.1 for iPhones, according to Macrumors. They say they see visits to iPhones executing iOS 18.4.1 in their visitors to visitors. The software update will probably be published during the week or the next two.
As the version number indicates, iOS 18.4.1 will be a minor update, sending software bugs and / or security vulnerabilities.
Apple does not publish the developer or public beta for minor updates like iOS 18.4.1.
IOS 18.5 is also being tested and has been released to developers for tests. He will probably see a release in May to the general public. Until now, only two minor modifications of the mail application and parameters have been discovered in the IOS 18.5 beta version.
IOS 19 will be unveiled during the WWDC 2025 Keynote on June 9 and will be published shortly after the unveiling.
