Re: Would Richard Grayson be part of this movie?
The Crime Syndicate (an evil counterpart to the Justice League) has invaded Earth and defeated the three Justice Leagues of Earth, following Trinity War. Nightwing was beaten by Owlman (Batman's counterpart) and unmasked live to the world as Dick Grayson.
Forever Evil #6 says we will see the "final fate of Nightwing!" and it's widely known Dan Didio wanted Geoff Johns to kill Nightwing in another miniseries, Infinite Crisis.
Damian died for real, he was stabbed through the chest with a broadsword.