I think that JK Rowling did a disservice to herself by creating such an intricate fantasy world in Harry Potter. Any other attempt in fantasy would undoubtly be compared to Harry Potter, so I think that might be part of the reason that she might not wish to attempt another fantasy novel.
I hope though that she does stick with a book for all ages much like she did with the HP series. She has a talent to be loved by everyone young and old alike and she should continue in that vein. She inspired millions of children and teens and even adults to pick up a book and read in these times of many distractions (tv, computers, video games etc.), which in and of itself is a fantastic feat.
I think she should have a female protaginist in her next book, just to change things a little, but whatever her next book is I'm sure that it'll become a part of my book collection!
Just to stray off topic agin here though. Imagine this - The Twilight Series written by JK Rowling instead of Stephanie Meyer? Ormaybe immagine a Vampire Series written by JK Rowling (with no resemblence to Twilight) Although, I really don't want to see that. Vampires have been written about so often now and there is so much hype that I think that its quickily becoming annoying!
I also want to say that I agree that teh Twilight story did have a great idea but needed more character development. I really liked the character of Carlise (i think that was his name/) and would have liked to know more about him.
Anyways - congrats to both Lalitha and Chhilt - you were able to survive reading more than one book in that series so I bow down to your patience!!! :)