The Dawn of Justice Ultimate Edition is probably called the Ultimate Edition because it's much more marketable than the Not Stupid Edition. Lot of differences, added scenes, extended scenes. And when I say 'extended' scenes a lot of time it's just a single line of dialog that got clipped but... it's definitely a more complete story. Nothing is going to change the big fails, but at least the disjointed, nonsensical feeling is gone.
3 hours is a lot to invest in a movie if you hated the first go around, so I'll sum up the two big take-aways:
Lex Luthor had been manipulating Superman and Batman (and public perception of them) for a long time to their fight.
He paid off inmates to murder fellow prisoners with the Bat-brand. He created 'witnesses' for the desert debacle. Etc, etc. He personally requested Kent cover the party -- so, yes, he was straight trolling them because he knew exactly who they were, and that he was architecting a showdown.But as entertaining as that scene was, confirming it (by showing Kent's coverage as a specific request) now demands that WW's presence there was no accident given her photograph and makes you question that/how he's manipulating her.
Lex met Steppenwolf the Apokalips general
So the last scene is just overwrought, not Lex suddenly developed intergalactic precognition (as opposed to Batman suddenly developing interreality precognition).