Thank you all for the excitement and interest in trying the new Teams and sharing feedback on what you all are missing. Responding to some of the most asked questions from the thread:
1. The client is currently available for windows desktop users only. You can install this via the "Try the new Teams" toggle in current Teams app. Direct installations are currently blocked.
2. Yes, there will be support for Mac, web, VDI, Education and GCC, GCC-H and other special cloud versions. Please follow this page to know as soon as we take this live New Microsoft Teams – Microsoft Adoption
3. If you are an admin and looking to learn how to turn this on for your users, please refer Enable the new Microsoft Teams toggle for your organization - Microsoft Community Hub
4. Lastly, we are still working on some of your favourite features like "Publishing in multiple channels", "Find in chat" and more. Stay up to date by bookmarking https://aka.ms/NewTeams where all our information will land and be regularly updated.