Outlook new features include the new navigation pane, message reactions, Outlook and Teams integration, Dictation updates and lots more. For the Outlook 365 Desktop updates, you'll need to be an Office 365 subscriber.
Top 20 Outlook tips and tricks:
Top 25 Microsoft Outlook Calendar Tips and Tricks
20 Outlook Web Tips and Tricks | Microsoft Outlook 365 tips for Email, Calendar, Teams & more