Just downloaded this earlier in the week and so far it looks like a great resource!
If you’re interested why we would need a new catechism, here’s Tim Keller’s explanation.
Also, as it says at the end of the article, “Starting next week on October 22, you can join the one-year campaign to delight in the attributes and work of God by learning New City Catechism. Next Monday, you can subscribe to weekly updates via e-mail or RSS on the New City Catechism blog.”