I think that "magazine" is fine. As is "sublemmy". But I kind of am not enthusiastic about having two different words for them, unless there are future plans for them to act very differently.
From a user standpoint, unless he's talking about the internals of the server involved, there isn't really a difference. Saying "sublemmy/magazine" is just verbose and annoying. I'm on Kevin, but I want to be able to refer to magazines/sublemmies in a way approachable to all the people reading the content.