New Change Set Components

The components available for a change set vary by edition. These components are now available for change sets.
Available in Enterprise, Performance, Unlimited, and Database.com Editions

ChatterExtensions
Represents the metadata used to describe a Rich Publisher App (pilot) that is integrated with the Chatter publisher. ChatterExtensions is a pilot feature in API version 40.0.
Network
Represents a community, which is a customizable public or private space for employees, customers, and partners to connect.