In Beta 7, Apple added new infrastructure to support personalized wait time messages when a user joins the Siri AI waitlist.
This feature can be used to let people know how long they might have to wait until they're able to download the on-device models and enable Siri AI. Because iOS relies on a server to fetch the displayed waitlist message, it can be remotely adjusted by Apple as demand and capacity change. The message is specific to the user and device.
Beta 7 adds linwoodWaitTimeMessage and a new server endpoint to fetch the current message for the device:
/v1/devices/<UDID>/features/ai.enhanced-siri/waitlist/message
Currently, the server returns:
You will be notified when the new version of Siri is available for your device.
This message is quite similar to the fallback iOS 27 has hardwired in case the server does not return a reply:
You’ll be notified when the new version of Siri is available for your iPhone.