Marvel and Edgar Wright jointly announced today that the studio and director have parted ways on ANT-MAN due to differences in their vision of the film. The decision to move on is amicable and does not impact the release date on July 17, 2015. A new director will be announced shortly.
Wright had been attached to "Ant-Man" since 2006, two years before Marvel's original "Iron Man" film was released. The "Shaun of the Dead" and "Scott Pilgrim vs. the World" director also co-wrote the script with Joe Cornish. In 2012, Wright appeared at Marvel Studios' panel at Comic-Con International in San Diego to debut "Ant-Man" test footage.
This isn't the first high-profile directorial shift at Marvel Studios -- in 2011, "Monster" director Patty Jenkins left the "Thor" sequel, which was ultimately directed by Alan Taylor.