Difficult to say right now. While it’s bragged that AI can already “create” games and “webpages”. Current approaches rely heavily on human prompting and trial and error. Plus said dev AIs work best when creating common, simple, short projects. The AI will just auto complete stuff, and if its wrong, well it can’t tell the difference. Actual programs created by humans are multitudes of machines working together in perfect sync. It involves progressive iteration and refactor, as well as requiring many types of languages, data, images, sound, API use, organization, planning, and references (often from closed source programs) if it has any hopes of working.
Something as ambitious as an OS? Given the size of the task, you might as well wait for the singularity when all bets are off.
Been using it as well. It requires practice, but it does feel like a better typing experience for a mobile device.