One of the actors has spoken about TF4 "NOT being a kids movie".
Which isn't new. The second and third ones had a lot of violence, and I think DOTM was the one that had trouble getting under an R rating in America.
And this is a new actor to the franchise, and he hasn't even seen the finished product, so unless there was heaps of blood, or heavy coarse language, or a sex scene in the parts he was in, I don't think he would have a clue.
But the funny thing is, if he is actually right... why have so many "under 5" toys if none of that age group would (should) be seeing this movie? (especially if it ends up being as bad as this guy claims)