There have been coordinates put on Harry Potter fan sites (like mugglenet.com, for example). Our job is to plug them into the map at secretstreetview.com where the coordinates will take us to places important to either JK Rowling or Harry Potter. At each location are letters that need to be unscrambled.
All of the fan sites in question are completely overloaded, so I managed to find a site that had all of the coordinates on it (I know it's kind of cheating, but how was I supposed to get them otherwise?) I'm not sure if there exists an original list of sites to go to or not. On the site I used, coordinate four does not work for some reason, but here are the correct ones: -23.547149,-46.520266
Go try everything out! It's fun! And if you don't want to know what the letters spell out... don't look at what's below this very lovely .gif!
By now, most people have figured out that the letters spell out POTTERMORE. You can follow @pottermore on Twitter to keep up on the news. No one knows what exactly Pottermore is and there's already a lot of speculation. The spelling is confirmed by a Brazilian fan site which noticed a trademark registration for "Pottermore." Further investigation has told me this: Warner Brothers filed the patent in 2009 and was granted an extension on it this year. You can check out the site where I found the patent for youself here.
There is now also a website: www.pottermore.com Nothing's on it yet, but it's got JKR's signature on it which is exciting.
I can't wait to find out what this is all about. With the movie series coming to a close, we've all been looking for something to keep us going, and this might just be it!