We’ve brought the workspace switcher up from the Multitasking View directly into the Dock. You can press the “+” tile to open new workspaces or select an existing workspace to switch to it, drag-n-drop to rearrange workspaces and, clicking on a workspace that’s already open will show the Multitasking View

Password authentication dialogs have a new feature in a Secure Session: when opened, the rest of the screen will dim and other windows won’t be allowed to steal focus. This prevents accidentally typing your password anywhere other than the authentication dialog and you’ll be able to make sure these are legitimate system dialogs and not an application trying to read your password