Windows 11 will include a consumer version of Teams, which looks as if it will be the first iteration of Teams 2.0, a new architecture which replaces Electron with Edge WebView2 as the basis for the Teams client. Microsoft predicts that the change will reduce the memory footprint by half and make it possible to introduce some new features. There’s no dependency between Windows 11 and Teams 2.0, but given the amount of work needed to make architectural transitions, it’s unlikely that we’ll see an enterprise Teams 2.0 client until sometime in 2022.
Microsoft will retire the Windows S client for Teams on November 29, 2018. The decision to double-down on the Electron-based client is probably due to the fact that not many people use Windows S.