Introduced yesterday... Microsoft Teams, the latest addition to Office 365, that makes it easier for you to chat in groups, socialize, and collaborate. This may really have a coolness factor!
Microsoft Teams is available now in beta form. Microsoft expects the first general release to take place in 2017, Q1.
In the meanwhile it looks like Microsoft is integrating Teams with other platforms as well... for example Visual Studio Team Services,
Some quick links and a video here, for the moment...
(video) Introducing Microsoft Teams (in Preview)
(video) Introducing Microsoft Teams (in Preview) - Deploy and Manage Microsoft Teams
Introducing Microsoft Teams (video)
Microsoft Teams: Step-by-step intro for using, enabling and managing the experience (video)
Three Easy Steps to Activate Microsoft Teams (video)
What is Microsoft Teams?
Setting up Microsoft Teams (preview) for development
Introducing Microsoft Teams: The new chat-based workspace in Office 365
Microsoft Teams makes work-chat simple: 5 things you need to know
Microsoft Teams integration with Visual Studio Team Services