New notification style
The next time you get an incoming call or a notification that a meeting has started, you'll notice a refresh to the look and feel of the notifications.
Same org chart, new location
The organizational chart has moved. Instead of being a tab in the chat, hover over on someone's avatar and the contact card will expand to show quick actions, as well as the org chart and contact info.
New Teams, classic look
You can now choose the classic Teams theme in the new Teams app. Update your theme in Settings to get that classic purple look you're used to.
Ring, ring—get notified on multiple devices
In Settings, you can now choose to receive incoming Teams calls on a secondary device, not just on your computer.
Search in chat and channel
You can now focus your search to the specific chat or channel you're in by using Ctrl+F (Cmd+F on Mac).