Link to published 2017 spec and both other repos.

README.md

@@ -1,6 +1,11 @@
 
 # Web Media API
 
-This repository contains the [Web Media API](https://w3c.github.io/webmediaapi/) specification that is being worked on by the [Web Media API Community Group](https://www.w3.org/community/webmediaapi).
+This repository contains the [Web Media API Snapshot](https://w3c.github.io/webmediaapi/) specification that is being worked on by the [Web Media API Community Group](https://www.w3.org/community/webmediaapi). This specification details Web APIs that should be included in device implementations to support media web apps.
 
-Web Developers and Web Media App creators should reference the [Web Media Application Developer Guidelines](https://github.com/w3c/webmediaguidelines/) on implementation guidance. 
+- [Web Media API Snapshot 2017](https://www.w3.org/2017/12/webmediaapi.html) was published 20 December 2017
+- Web Media API Snapshot 2018 is planned to be published Q4 2018
+
+[Web Media API Community Group](https://www.w3.org/community/webmediaapi) also maintains repositories for two other specifications:
+- [Web Media Application Developer Guidelines](https://github.com/w3c/webmediaguidelines/)
+- [Web Media User Agent Integration](https://github.com/w3c/webmediaporting)