OWA searches Office 365 Groups and the mysterious appearance of a Message Center email digest

Microsoft has long used OWA as the test-bed client for new features. After all, it's easy to update a web client. Now they've added the ability to integrate content stored in Office 365 Groups in OWA searches. It's a nice feature, as is the message digest for Office 365 updates that you can have sent to your mailbox (even if Microsoft never revealed this feature in the Office 365 roadmap).