Groups are still unavailable to the public, though they shall be arriving in the very near future, Right now only staff can really setup groups, so long as they know how.
changing the css and layout will be available in the future, I think. They will probably restrict a few things, I heard the development team speaking about restricting the top task bar where you can access the "artician , submit, control panel" etc. As people have started to alter the artician logo, Which isn't intended. Apart from that, they'll probably continue to addon to the modules etc.
Glad you like the site by the way
