From reddit Home Automation:
2 points·2 hours ago
Google is moving processing local for Nest and the rest of their hardware. Currently in beta but will be available later this year.
Here is a video that explains how Google created a type of containers and moved the cloud processing to local. This is the back-end. Basically the JS that use to execute in the cloud now executes on the local devices.
Then they are also moving the front-end to local processing.