It would seem that the UK Shop at Home site has just released the LEGO Harry Potter set 10217, Diagon Alley, ahead of schedule (perhaps to get some additional sales on the books before years end?) This is a LEGO exclusive, so unless you have a bricks and mortar LEGO store near you, this may be difficult to come by.
Retailing at 132.99 GBP. The set comes with 11 minifigures including exclusives of the Weasley Twins and Mr. Olivander. I still can't tell from the pack shots if the Gringott's Goblins have facial print, but I would be surprised if otherwise.
Pick up the new Diagon Alley set at Shop at Home today!