A part of me thinks there was a strategic reason for showing Woody Harrelson staring at a photo, the girl caring for Ceasar, and the Dawn leads of Keri Russell, Jason Clarke, and Kodi Smit-McPhee. It looks like it is alluding to a connection between all those individuals. Maybe the girl is the daughter of Harrelson's mad general, while Harrelson is McPhee all grown up. It would be interesting for a character who was compassionate and an ally of Caesar to grow up bitter due to losing parents or some other similar tragedy. I know this movie is set many years later, so definitely enough time for McPhee's character to grow up, and I don't see why everyone from the past film has to be dead.
I also dig the compassion theme of the trailer and hope that is a reflection of the movie. Something about how bridging understanding between the two groups is important, and how this battle is a great tragedy. A little bit of hope and reaching for love amongst the violence and chaos. It doesn't need to be preachy, and the previous two were very solid at having a message but still doling out the blockbuster everyone came to see. You can have fun and smarts, and usually, a smart movie is far more fun.