I'll admit it - not only have I read all of the Harry Potter books, I've reread them and enjoyed them. And I'm waiting for the next one like a kid.
It will be a while yet though. Apparently the author, J. K. Rowling, is having a hard time with some of it. Among other things, she has to deal with 15 year old witches and wizards, who presumably are as horny as we Muggles are.
Another complication has been a lawsuit alleging that Rowling stole some of the characters. That has been settled in Rowling's favor, but it's just one more thing on top of a marriage and a pregnancy to make things harder.
But when she delivers the book, watch out. The last one had so much impact on book sales that Borders and Barnes and Noble mentioned it on their annual reports. Maybe there's a stock market play in this.