This feature request is working its way through the backlog queue. No new details are available yet.
We have started using teams, but run an on premise version of SharePoint. I thought we would move to SharePoint Online, and then hook Teams into that migrated version and work on documents via Teams.
Like everyone else, there is now point doing this as we would still be running two separate SharePoint Online sites, which is just confusing for everyone.
Please introduce the capability to link Teams through to an existing SharePoint Online site.