I am excited, have my copy reserved, and am paranoiacally trying to avoid all spoilers. I have terrible luck with spoilers; with the last Harry Potter book I accidentally learned the ending beforehand. I even had Anna Karenina spoiled for me -- the ending was featured in a Jeopardy! question while I was in the middle of the book. I will be wearing headphones on Friday night.
It will be exciting, I'll be there at midnight, and I am really amazed and happy that a book release can still generate this much excitement.