May contain spoilers. Certainly contains theory.
1. Captain America was shot by Winter Soldier.
2. The dead Captain America is later reveal to be a Life Model Decoy (or yet another shaping shifting mutant). In the interim, Bucky Barnes and Steve Rogers are back on the same page being heros against the oppressor state.
3. Batman gets killed at the end of World War 3, just to prove that DC is still edgy. Batman’s death is counteract by Tahlia’s last remaining last remaining last remaining Lazarus pit, (y’lknow, the one of the five hundred last remaining pits that weren’t sealed up during the great Pit Covering of pre-Red Hood), thus proving that edgy != creative.
Well, you know that Tony Stark had to live because there’s an Iron Man movie, Bruce has to come back for the Batman movie and and Reed need to be around for the Fantastic Four movie. Pity there isn’t a Captain America movie.