Instead of workspace permissions you are now able to set up your member permissions on board level.
You can set these permissions on every board. Go to board settings (dotted menu on a board / edit) and click on Permissions. Your current restrictions and permissions of your workspace are transferred to the new system.
You can find more about the new setting here.
With the new workspace settings you can restrict the way people login.
Your are now able to restrict the member so they can login with email, google and office 365, Only Google or Only Office 365.
As an admin you can set this up in your workspace settings.