OK, Stephenie says that Breaking Dawn will be the last book in Bella's perspective. She also says that she is going to take a break from writing. Stephenie said that she has other stories to tell, but she may revistit Twilight. I hope that this (in some weird way) answers your questions. Oh, and don't forget about MIdnight Sun!! I would check out Stephenie's website: stepheniemeyer.comm if I were you.
"Look after my heart, I left it with you." -Edward Anthony Masen Cullen