Midnight Sun- Is the counterpart of Twilight, as it was from Edward Cullen's point of view. This book is confirmed; the release date, however, is unknown. As soon as we find out, we will let you know!
UPDATE: Stephenie announced that Midnight Sun is halfway written through, and it is over 300+ pages. There will not be not much new dialogue; it will "borrow" a bit from Twilight. But there is "more to Edward's side of the story than Bella's. Link to the first chapter on Stephenie's site.
http://www.stepheniemeyer.com/pdf/midnightsun_chapter1.pdf
Don't redistrubute, claim it as your own, reproduce , or retranscipt it, that is illegal. Enjoy!