It was bound to happen...... according to all sources, Stephenie Meyers has announced that she has become 'too burnt out on vampires' to continue writing the Twilight companion book, 'Midnight Sun', which tells the Twilight story from Edward's perspective. After writing '....Bree Tanner' as a spinoff novella when she was only asked to write a short story, the whole story line was becoming stale for her. But don't fear, all you Twilight fans, she's simply leaving the story aside for a while until her enthusiasm for the subject returns. So, I'm sure it won't be long at all before Bella, Edward and the gang make a reappearance.
Attached is a link giving you all the information you need.