I don't know if you guys have seen this video, but at the end ( minute 2:33) She says it is a possiblity that she writes again about the story, but not from Bella's perspective.
I would love to know what happens to the pack, Nessie and Jacob, Charlie, the Voulturi... In the way she says that she knows wich path she will go I can see that she has thought a lot about it.
Do you see this happening? I really hope so! even in a couple more years or more, I don't care, but I hope it happens some day!