DC are kicking ass in the animated movie world for the past few years, well compared to Marvel that is anyway the DC movies are far superior. The plot of the movie is based on the 2006 storyline Batman & Son written by Grant Morrison, the film is set to release in the next few months and now we have a trailer for it.
"Batman learns that he has a violent, unruly pre-teen son with Talia al Ghul named Damian Wayne, who is secretly being raised by the League of Assassins.
After Ra's al Ghul is killed by Deathstroke and his team takes over the
League of Assassins, Damian swears vengeance and decides to kill
Deathstroke. However, his methods are not approved by Batman, causing
conflict between the two of them." via Wiki