Filming for Breaking Dawn will start at the end of October. This is after make up tests and rehearsals are done. The shoot will be 6 months. लपेटें will be around March या April, however that depends on how filming goes.
Part one is out November 18, 2011. Part two doesn't have a release तारीख, दिनांक as of yet.
EDIT: Part two now has a release date. November 16, 2012