Harry Potter author, J.K. Rowling, is about to launch something new. It’s called “Pottermore,” and unfortunately, I can’t tell you any more than that. Not because I’d have to kill you, but because I don’t know. Nobody does. While Rowling has apparently already stated that Pottermore is not a new Harry Potter book, there have been no other details released about the project. 

But there’s plenty of Harry Potter goodwill in the world that most fans won’t need to know what it is to get excited about it. And to help build that excitement, Rowling is using a customized, Interactive YouTube video page.

But first, there’s the Pottermore website itself:

As you can see… there’s not a lot of detail there. But the owls look cool, don’t they? Maybe even enticing enough to click on. And if you did that, you’d be taken to the Pottermore custom YouTube page, which looks like this:

The countdown on the “video” is live, which means we’ll learn what Pottermore is about five days from the time I’m writing this: or sometime around 2:00AM Eastern on Thursday, June 23, 2011.

The page is interactive, which means it’s much more enjoyable if you actually go there and experience it yourself. You can hover over the owls and they’ll all perform some kind of small movement or action–bob or shake their head.

Whatever Pottermore turns out to be, it must be pretty big to go to this kind of trouble. I’d also have to imagine that there will be even more cool video interactivity once the official announcement has been made–at least, I hope that’s the case. Interactive video is far more engaging and memorable than traditional video. And despite Rowling’s built-in audience, this kind of viral campaign can still help generate buzz and interest.

Any guesses out there as to what she might be up to? Video game? New book series with new characters? Potter-themed social network? Let me know what you think in the comments below.