Add details to About Docker EE topic (#2636)

Fixes #2606 .

Author: Jim Galasyn

enterprise/index.md

@@ -1,20 +1,66 @@
 ---
 title: About Docker EE
 description: Information about Docker Enterprise Edition
-keywords: enterprise, enterprise edition, ee, docker ee, docker enterprise edition, lts, commercial, cs, cs engine
+keywords: enterprise, enterprise edition, ee, docker ee, docker enterprise edition, lts, commercial, cs engine
 ---
 
-Docker Enterprise Edition (Docker EE) is designed for enterprise development and
-IT teams who build, ship, and run business critical applications in production
-at scale. Docker EE is integrated, certified, and supported to provide
-enterprises with the most secure container platform in the industry to modernize
-all applications. For more information about Docker EE, including purchasing
+Docker Enterprise Edition (*Docker EE*) is designed for enterprise
+development and IT teams who build, ship, and run business-critical
+applications in production and at scale. Docker EE is integrated, certified,
+and supported to provide enterprises with the most secure container platform
+in the industry. For more info about Docker EE, including purchasing
 options, see [Docker Enterprise Edition](https://www.docker.com/enterprise-edition/).
 
-## Platform support matrix
+The free Docker products continue to be available as the Docker Community
+Edition (*Docker CE*).
 
-This table shows all the platforms available for Docker EE as well as Docker CE.
-The links in the first column take you straight to the installation instructions
-for each platform.
+## Supported platforms
 
-{% include docker_platform_matrix.md %}
+For the full platform support matrix, see [Install Docker](/engine/installation/#platform-support-matrix).
+
+This table shows all of the platforms that are available for Docker EE.
+Each link in the first column takes you to the installation
+instructions for the corresponding platform. Docker EE is an integrated,
+supported, and certified container platform for the listed cloud providers and
+operating systems.
+
+## Docker EE feature tiers
+
+Docker EE is available in three tiers:
+
+-  **Basic:** The Docker platform for certified infrastructure, with support
+   from Docker Inc. and certified containers and plugins from Docker Store.
+-  **Standard:** Adds advanced image and container management, LDAP/AD user
+   integration, and role-based access control. Together, these features
+   comprise Docker Enterprise Edition.
+-  **Advanced:** Adds
+   [Docker Security Scanning](https://blog.docker.com/2016/05/docker-security-scanning/)
+   and continuous vulnerability monitoring.
+
+## Docker Enterprise Edition release cycles
+
+Docker EE is released quarterly. Releases use a time-based versioning
+scheme, so for example, Docker EE version 17.03 was released
+in March 2017. For schedule details, see
+[Time-based release schedule](/engine/installation/#time-based-release-schedule).
+
+Each Docker EE release is supported and maintained for one year and
+receives security and critical bug fixes during this period.
+
+The Docker API version is independent of the Docker platform version. The API
+version doesn't change from Docker 1.13.1 to Docker 17.03. We maintain
+careful API backward compatibility and deprecate APIs and features slowly and
+conservatively. We remove features after deprecating them for a period of
+three stable releases. Docker 1.13 introduced improved interoperability
+between clients and servers using different API versions, including dynamic
+feature negotiation.
+
+## Upgrades and support
+
+If you're a Docker DDC or CS Engine customer, you don't need to upgrade to
+Docker EE to continue to get support. We will continue to support customers
+with valid subscriptions whether the subscription covers Docker EE or
+Commercially Supported Docker. You can choose to stay with your current
+deployed version, or you can upgrade to the latest Docker EE version. For
+more info, see [Scope of Coverage and Maintenance
+Lifecycle](https://success.docker.com/Policies/Scope_of_Support).