With this new feature, it becomes possible to manage users without them having a role giving them rights on your board.
Are you preparing your future action plans, need to assign someone to a project or milestone, but don’t want to give them access to the board? Instead of fiddling with tags or text, use phantom users!
This new user role allows you to invite someone to a board as a ‘Ghost’, which means that they won’t be informed of the invitation and have no access rights to the board, but you can reference them anywhere in your users columns or in your tasks. Practical, isn’t it? 
