What's new in iOS 12.2 beta 5: In iOS 12.2, when setting up a new Apple Watch, Apple is using location to make sure the ECG feature is available in a particular region, suggesting the company may be planning to geofence ECG functionality and limit it to the United States.
This would potentially prevent customers who purchased a U.S. Apple Watch but live in another country from using the ECG feature. Location is verified via SIM card and can't be bypassed during Apple Watch setup.