Ford is expected to announce next Monday that it will build the next generation Mustang at the AutoAlliance plant in Flat Rock, Michigan, it jointly owns with Mazda, Reuters reported. Ford spokespeople declined to comment to Reuters on the topic of a press conference called at the plant for Monday, but a source familiar with the company's plans told the news agency it would announce the long-rumoured move of Mustang production from an ageing plant in Dearborn.