I'm starting to avoid trailers as they are just giving away too much. With this they pretty much gave away the whole story.
Also I think they are going to say this is Maximus' son and that is bull. He had not seen her in many years and their children were the same age. He wa suprised to learn her son was the same age as his. There was no indication of anything, plus her husband was a friend of his, and that would make Maximus a piece of crap, and it is total B.S. if they do it.
There was one other problem. What was it? Oh yeah, Maximus is dead so WTF is the point???? If there was ever a movie that did not need a sequel this is it.