Commenting on a rumor that she had written 750 pages of Book 7, JKR said:
"Oh pleeeeeeeeeeeeeeeeeease. I haven't written 750 pages of book seven, and if I had, I'd be very worried, as I'm not close to finishing it yet."
Ok, I'll admit, when I first heard the rumor 750 pages seemed like a bit much. After all, if she's got that much written, why not just say, "I'm almost done." But did she have to add the, "I'm not close to finishing it yet"? Those are words to crush my little Harry lovin' heart.