"40 years after the war against the Foot, a Japanese ninja clan," the description states. "Four mysterious veterans are preparing themselves for the fight of their life."
This is a fan-made video a student created for their thesis at the Academy of Art University. The turtles are grown up, both the Shredder and Splinter seem to have passed away, but they're still fighting the good fight. This is more of a tease than anything else, and the design of the Turtles is certainly a more "realistic" look at what a walking turtle may look like, for good or ill.
If you've ever been frustrated that everyone carries cutting weapons without cutting anyone in the world of the Ninja Turtles, here you go. Enjoy!