It's increasingly likely that the OLED iPad Pro won't arrive until 2024, but the iPad Air is expected to get an upgrade later this year.
The next generation of iPad Pro is tipped to get not just a high quality OLED display but the next generation M3 processor too, and that means it’s not going to make it into the late-2023 launch window. Apple tends to launch new iPads and Pros in September or October every years, and the new Pros won’t be ready in time.
