That is one short and succinct announcement.
"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."
Marvel, might I suggest that this was not your best move ever?
Honestly, if Edgar Wright and his co-writer Joe Cornish had not stayed dedicated to the idea of making an "Ant-Man" movie in the first place, I doubt this would be a film that would have been tapped as a major cornerstone in Phase Three, which kicks in after Marvel's release of next year's "Avengers: Age of Ultron." As far back as I can remember Edgar talking about the movie, it's always been something that he and Joe kicked around as a crazy sort of left-field idea. Marvel took some serious convincing, and they've been more than happy to leave the development on a time-table that had nothing to do with marketing. They even put it off so Edgar could finish the Cornetto trilogy with "The World's End" first because there were personal reasons for wanting to finish that film in a timely manner.