President of the Rio Film Commission, Sergio Se Leitao, confirmed via Twitter that Breaking Dawn production (assumed to be specifically for Isle Esme, not the entire production) is headed to Rio:
Dawn will be shot in Rio in November. With full support of the Rio Film Commission. For security reasons I can not say when and where.
The Mayor and Governor Eduardo Paes Cabral directly engaged to enable the filming of Dawn in the River Plate Gol!