The ability to use multiple Teams accounts at the same time is supported on iOS & Android today. The feature team is continuing to work on support for multiple accounts on desktop. We’ll keep you posted as we have more details.
I’m switching the status to Partially Done.
The request for a Preview Team is still in the works. No new information is available at this time.
Team Discoverability is still being worked upon, no details are available at this time. If you support this idea please navigate over to the main topic and vote for it! https://microsoftteams.uservoice.com/forums/555103/
Change Prompt: this has been completed
We are now preparing for the roll out of Tasks in Teams which will integrate additional features integrating To-Do and Planner. This includes additional list views that also extend to tabs in teams. Further announcements about additional integration in our overall Tasks coherence effort will follow.
You can follow the rollout via our Roadmap item: https://www.microsoft.com/microsoft-365/roadmap?searchterms=57213. To see a preview of the experience, please visit https://youtu.be/rTATVGroEsQ.