New Federated API Model
Going forward, the API will undergo a new federated model. There will be separate endpoints for different functionality such as Posts, Reviews, etc. Each endpoint will have a different base URL. This allows for much greater flexibility when it comes to consuming the API as well as launching new features.
This change will be greatly beneficial and allow Google to release new features, updates, and fixes sooner.
Reference to all the upcoming API are listed here. On release, any corresponding v4 endpoints will be deprecated and turned down within 90 days.