This is a trailer for a fan-film based on Final Fantasy VI. It looks fantastic. And it will probably never be made.
That may sound overly cynical, but history has not treated these sort of projects well. Just a month ago, a team of film-makers launched a Kickstarter for their Final Fantasy VII fan-film, and Square Enix's lawyers promptly shut them down for violating copyright. The folks behind that fan-film tried to get permission from Square to make it happen, but they never quite could.