I turned on Team Central Beta to try it out with a few colleagues, but now I can't get rid of it. And it started automatically adding new users! I had to manually, individually remove 72 users from the group that got created. They were added to the group before I noticed it was happening and 'Team Central' was showing up on users' menus.
Very annoying way to roll-out a product - it should be the admin's option to turn it off and assign users.