According to IFilm on Sept. 9, Edgar Wright's film, "Ant-Man", has been moved from Nov. 5, 2015 to July 31, 2015. This is considered the first film to start off phase three of the Marvel Cinematic Universe, but no reason was given as to why the release date was changed. There are some thoughts given to the fact it did not want to have to compete against "Bond 24" and perhaps that this would be the best time to garner child audiences during their summer vacation.
That being said, this makes Disney with four confirmed summer release dates for "Ant-Man", "Avengers: Age of Ultron", "Inside Out", and "Pirates of the Caribbean 5". This makes very little possiblity of "Star Wars: Episode VII" ever coming out at that time and the likelihood of its release date getting closer to winter. There is also another theory involving the possibility of Marvel Studios squeezing in another one of their movies that winter.
Last month, friend of Wright, Simon Pegg, made a suggestive gesture that had made fans speculate that the "Shaun of the Dead" actor would be the next Ant-Man, but nothing could have been further from the truth when Pegg was just paying the studios a visit.