The working title of the film is Black Panther: Trouble In Wakanda, and it is expected to be a straight to DVD release. The movie has a tentative release of 2018. (Probably after the release of MARVEL's Black Panther, which comes out in February.)
The LEGOS franchise has been a hugely productive entity, making a number of theatrical and straight to video films and TV shows. This includes a number of superhero based films, from the feature film The LEGO Batman Movie to the TV series LEGO Marvel Super Heroes: Maximum Overload.