The Google Cloud Prediction Go Sample Code by Google demonstrates API interaction with JSON requests and responses in a variety of contexts. Library available at https://github.com/GoogleCloudPlatform/google-cloud-go
Google Cloud Vision API is a REST API that will help developers analyse images like never before. It supports various features like Entity identification, Facial Detection, Landmark Detection, Logo Detection, OCR and Identifying Explicit content. It is available in Limited Preview for now.
Google has made several announcements including the launch of the Google Consumer Surveys API, the general availability of the Google Cloud Vision API with new features, the launch of Google Cloud CDN Beta, and the launch of Autodesk Maya. The APIs are available on the Google Cloud Platform site.