Kind of sucks that they're putting their "Deep Technical Reviews" behind a pay wall... I've really enjoyed a few of those in the past, but probably not $50 worth. Could be an opportunity for micro-payments I suppose.
Content behind the pay wall will be additive and complement what's already there. John Siracusa's going to have a subscriber only chat, for instance, but his massive Snow Leopard review was (and is) freely available.
We'll be doing exclusive chats and some new types of content that only subscribers can see, but the normal Ars bread and butter will be free for all.