There's new API and some header documentation for "Location Push Service Extension"s.
I haven't seen any sessions related to Core Location scheduled beyond Meet the Location Button
Is there any documentation for this I have missed?
The Location Push Service Extension gives location sharing apps a power-efficient way to send an APNS push to a device to retrieve the user's location.
An incoming location push wakes the app's Location Push Service Extension. The extension can obtain the location from CLLocationManager, end-to-end encrypt it, and send it back to the server. The user must give your app "Location Always" permission in order for the extension to run.
Documentation for this API will be available soon.
There is also a new entitlement to use this extension. You can apply for it here.