The 10 Cloverfield Lane Thailand facebook page has a new 10 Cloverfield Lane poster which contains a major spoiler, revealing something that happens at the end of the movie.
It's a completely different approach to marketing the film, and ruins the surprise of the 'monster' at the end of the movie. However, since this is a Cloverfield movie, most people assumed there would be some kind of monster somewhere in the movie, so it's hard to say how much this would affect the impact of that scene.
Here is the full poster:
