Plans for Breaking Dawn already in the works

The Wrap is reporting that production for Breaking Dawn will start in late spring 2010 but Summit has yet to confirm nor have they've denied this rumor.

With the sequel to the blockbuster hit "New Moon" now filming in Vancouver and
its sequel, "Eclipse," already deep in the planning stages, an individual close
to the production has told TheWrap that work on the fourth and final in the
series, "Breaking Dawn," will start in late spring 2010.Summit Entertainment
spokesman Paul Pflug declined to confirm or deny the report, saying only,
"Summit has no comment on that rumor at this time."

Some say when they say no comment then its probably true....so TS will keep a close watch on any date changes.
Source: The Wrap