J.K. Rowling has a big announcement to make tomorrow. If you're a fan of anything in the Harry Potter universe, and you haven't been to Pottermore.com, now would probably be a good chance to swing by the site. Basically, little hints have been sprinkled around Harry Potter fansites and other places on the internet, leading to Pottermore, and then if you click on one of the owls, it takes you to a