This feature request is still on in the backlog. No new updates available at this time.
As we announced at Microsoft Ignite 2019 this morning, we are excited to confirm that Multi-window capabilities are coming to Microsoft Teams, and will start rolling out to the public ring early next year!
Alex & the Teams teamAnonymous commented
when is early next year, January, financial?
This feature is on the backlog. We’ll update when we have more details.