Microsoft released a new chat based workspace for Office 365. Persistent chat, document storage, and instant meetings are some of the key features of this new capability. It is currently available in preview with general availability to come soon
Microsoft Mechanics is a great YouTube channel that can keep you up to date on all new offerings and updates for Office 365.
Microsoft Garage is comprised of small teams within Microsoft and functions as an outlet for experimental solutions. One of those solutions is FindTime, which is designed to save people time when scheduling meetings with multiple attendees. Invitees can view and vote on the times that work best for them.