The video begins with Kevin (a scary, shaven-headed James McAvoy) kidnapping three teenage girls and locking them in a basement.
The story has been kept largely under wraps until now.
Shyamalan's most recent outing "The Visit" was a neat old-school horror, also centring around a teenaged girl, and it seemed like a return to form for him after high concept flops "After Earth" and "The Last Airbender."
McAvoy has been joined in "Split" by Anya Taylor-Joy, who shone in her starring role in "The Witch."
"Split" is produced by Jason Blum, who is considered the new godfather of horror.