I know but I'm guessing this is from a DVD and this is all that is shown at the end. 
This is a DVDrip but the official DVD / BluRay release isn't until September, so there's a good chance there'll be a little more editing before then. Sometimes things get passed on to the "scene" a little early by insiders.
edit - just put it on and the Thanos scene is where it should be: at the end, right after they gloss over all the Avengers' gear and before the credits start to run.