It’s a standalone movie

When Warner Bros announced the full slate of DC Extended Universe movies in 2014, this year’s Justice League was just Part One. However, time passed, the studio lost its trust in Zack Snyder’s vision, and the Part One concept was dropped.
Although it appeared that Justice League Part Two would still happen, it was also possible that it wouldn’t. Originally slated to come out after Justice League, Part Two was postponed indefinitely, and Zack Snyder was removed as director. Although we were first meant to believe that Steppenwolf’s arrival would be followed with Darkseid’s appearance, the studio has changed its plans.
We can be certain that Justice League will be a standalone movie, so we can also be certain that it won’t end with a cliffhanger, as two-parters often do.
The Flashpoint announcement reinforces our belief that the DC Extended Universe is heading toward a soft reboot. So we may have to wait several years before we see Darkseid wage war to find the Anti-Life Equation (Zack Snyder teased this before dropping out of Justice League).
