There was a rumor a while back that the movie would show Steppy defeat the League, but Flash foes back and changes things so they win. I think I can see it happening, too.
In the original scene, Wondy probably misses her sword and dies, so Flash tips it to her in time.
In the original, Batman lands in the Knightcrawler and says "my turn."
You see the crawler get messed up, so Flash puts Cyborg in the Crawler, which you see in the new scene.
In the scene where Flash is running in slow mo near the Superman monument, it looks like he throws something. Maybe to Bats or Aquaman.
All I know is that there were rumors for BvS that we all laughed off, and some ended up being true. I hope this one is, because it would be one hell of a sequence to watch.