UPDATE: Create Office 365 Groups with team sites from SharePoint home moving beyond First Release

Wohoooo! Content Type Syndication! This is big, as it is a major hassle to do this manually.

Scenario: usage of third party addons like harmon.ie that store .msg with metadata in SharePoint libraries requires the use of a custom email content type. 

I'm still hoping that Microsoft eventually implements this on their own, or at least enable drag n drop to Group Inboxes.