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You can now refresh Power Query data from data sources that require authentication in Excel for the Web.
GA date: October CY2023

Use @mentions in comments to create, assign and track tasks within your document.
GA date: December CY2022

You can now switch between editing, reviewing, and viewing documents in Word based on the job that you are working on. (e.g., Viewing allows you to read the document without making accidental changes. Reviewing allows you to leave behind suggestions via tracked changes or comments).
More info: https://insider.office.com/en-us/blog/easily-switch-between-editing-reviewing-and-viewing-documents-in-word
GA date: September CY2022

, Your Signature settings are stored in the cloud, so your experience is consistent when you access Outlook for Windows on any computer.  This feature has released to production Current Channel, Monthly Enterprise Channel, and will advance to the remaining channels as they update to Version 2303 or higher.
GA date: April CY2023
Preview date: October CY2022

The Message Recall feature in Outlook for Windows is extremely popular with users, yet it doesn’t always work so well. Part of the problem is that the recall is client-based, and the recall can only happen if the recipient also uses Outlook. With millions of users with mailboxes in Microsoft 365, we’re now able to improve message recall by performing the recall directly against the recipients’ cloud mailboxes. So it will no longer matter which email client the recipient uses, the recall will happen in their cloud mailbox, and when the recipient’s email client syncs with their cloud mailbox, the message will be gone. While there are still some scenarios where a recall won’t happen (like for messages sent outside of the Microsoft 365 organization), moving the recall to the cloud significantly improves the recall success rate. Additionally, users will also now have a single message recall status report that will make it simpler to track the recall status for all recipients.
GA date: February CY2023