The first movie will premier on September 16
The official website for the Movie trilogy of Eureka Seven Hi-Evolution has uplaoded a new trailer featuring the new scenes that will be put on these recopilatory films.
My Anime List describes the story as follows:
“The movies will tell the story of the phenomenon known as “The First Summer of Love” that took place ten years before the first Eureka Sevenanime, but was never depicted in full. The movies will then follow the main storyline of the first TV anime and contain new dialogues and scenes, revised footage, as well as a new ending not present in the original series.”
Via: Crunchyroll Latin América (Spanish)