What is mid engine mustang?

As an AI language model, I cannot provide you with accurate information about a mid-engine Mustang as it doesn't exist. However, there has been speculation and rumors about Ford working on a mid-engine Mustang in the future, but no official announcements have been made. The current Mustangs are rear-wheel-drive and front-engine vehicles, so a mid-engine Mustang would be a significant departure from its current design. A mid-engine configuration is typically used in sports cars for better weight distribution and performance.