Excellent news on the manageability front for S2D. The April update for Windows Admin Center (‘Project Honolulu’) in combination with KB4093120 adds support for Hyper-Converged Infrastructure deployments running on Windows Server 2016 (RS1). Do note that this is still in preview.
To get started you’ll need to download the latest version of Windows Admin Center, and install the April 17th 2018-04 Cumulative Update for Windows Server 2016, KB4093120, on every node in a Storage Spaces Direct cluster you want to manage. The Hyper-Converged Infrastructure experience depends on new management APIs that are added in this update.
Don’t forget that there is a bundle of information on Windows Admin Center to be found in the documentation specifically around HCI.