According to announcement made by staff and cast during their stage event at ACE 2012, upcoming two films of mahou shoujo anime series Puella Magi Madoka Magica has been titled.

The first part will be subtitled “Hajimari no Monogatari” (The Story of the Beginning) while the second “Eien no Monogatari” (The Story of Eternity). Both films is set to premiere this fall in Japan. There were no news on third Madoka Magica film which will be an all-new story.

[Source]