According to website news, these are all fakes as they are taken from a monster contest. Basing on the supposed to be most believable spoiler, the monster has a human face with red eyes and there are small monsters shaken out to kill people in the city.
After all, everything will be revealed in next week.
The total spoiler of the film is here, if you do not want to know the details of the film story, DO NOT GO TO THE FOLLOWING PAGE. (it is there mentioning red eyes and human face)