In the original WatchKit, one could set up a WatchKit settings bundle which would specify settings to be included in the app's page within the Apple Watch app.
The settings were written to a shared NSUserDefaults identified by an app group name.
The WatchKit extension would be given an App Groups entitlement to allow it to read the shared NSUserDefaults.
All this worked well in the original WatchKit. I know, because I used it.
With Watch OS 2, the WatchKit extension runs on the watch and not on the phone. App Groups are [apparently] no longer used. At least, I have tried using them and the settings do not transfer from the iPhone to the watch.
So: in Watch OS 2, how and where are the settings specified by the WatchKit settings bundle stored, and how can they be retrieved by the extension running on the watch?