Thank you for your feedback! The team is actively working on this feature, we will share an update as soon as it’s available.
In addition to being available on Windows & Mac, we have released iOS 2×4 (mobile) and 3×3 (iPad), along with Large Gallery and Together Mode. You will see these options with the latest version from the app store. We are targeting availability for Android clients (mobile and tablet) this quarter as well.
You can read more about Large gallery view, Together mode, as well as other new meetings experiences here: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/new-meeting-and-calling-experience-in-microsoft-teams/ba-p/1537581
This feature request is still in the works. No additional updates are available at this time. I’ll keep you posted as I hear more.