While the teaser could always be just for a new video game or something, what gives credence to it possibly being a teaser for a new movie is the image in the background. Petco Park can be seen in the lower right hand corner of the image. Petco Park is near the San Diego Convention Center, where Comic-Con is scheduled to take place this upcoming week.
20th Century Fox released Predators back in 2010, and there have been ongoing rumors of a Predators sequel. 20th Century Fox has been teasing some big surprises at their Comic-Con panel. One of the big surprises is expected to be the announcement of a X-Force movie, but could they also be planning to announce a new Predators movie?