I'm very excited. Love the subscription model, it seems like a good price-point. Very excited about the two interface choices; sometimes I want pretty, sometimes I want efficient, other people only want one or the other.
Getting new players in a subscription model environment is an interesting problem, with many possible interesting solutions. I would think that new players could thrive on Base alone for a while; that's how I fell in love with the game. Once they are done with the 'learn to love the game' phase, new cards become appealing. I can't remember who suggested having feature card-of-the-week from other sets being free; I like this. Maybe every week a group of 3 cards from various sets, every game has one of the 3 cards. But then are there different game-queues? Full-set queues, Base-only queues, CotW-queues...? So like I said, interesting problem, interesting solutions.
General impression: yay, much excite!