Here are 2 scenes I imagined in my head which I think would be really good for this movie. Let's say the movie took place about 1 year after MOS as according to the latest rumors.
The first one follows-up events transpired in Man of Steel.
Here's another scene I had in mind involving both Superman & Batman:
Spoiler!!! Click to Read!:
(The audience sees Batman hacking into various computer networks attempting to track an assassin both of them are tracking.)
Batman: I've found him
Batman: The U.N. building in New York, there's going to be an induction of new countries to the U.N., if he's going to do what I think he's going to do there'll be a good chance of World War III.
(Batman then moves towards the Batmobile, Superman looks on)
Batman: You coming?
Superman: You won't get there in time with that.
(Cut to the sky where Superman is holding Batman as they're flying)
Superman: You know, for a guy named Batman you seem to be uneasy about flying.
Batman: I've got a plane for that.
(They then reach the U.N. building)
EXT. U.N. Building
Batman: You should be the eye in the sky for now, I'll look around.
(Superman flies upward, Batman sneaks into the building Arkham City style taking out various guards, so the assassin remains unaware of Batman)
(Cut to the assassin aka Deathstroke/Slade Wilson on the phone)
Slade: In place now.
Luthor: Take the shot. Draw the alien in.
(As Slade moves in on the rifle Batman appears, kicking the gun from Slade's hand)
Slade: You're not the freak I was expecting.
(Batman looks up)
Batman: Found him
(Superman flies in and restrains Deathstroke)
Slade: Do you really expect that that was my only plan?
Batman: Where's the bomb?!
(Superman uses his hearing to hear a faint ticking noise)
Superman: Hold him
(Batman restrains Deathstroke, Superman flies downward)
(Cut to a scene in the U.N. meeting)
U.N. speaker: We the United Nations wish to welcome the newest nation of Themyscira. The princess Diana would like to say a few words.
(The camera moves upwards to give the audience their first look at Diana aka the future Wonder Woman. As Diana moves to speak on the podium, little does she know the bomb is right beneath her.)
(Superman flies in, lunges for the bomb beneath Diana, crouches and covers it as it explodes, no one is harmed and Superman just saved everyone especially Diana.)
(The shock onlookers all started to clap and cheer for the Man of Steel.)
Diana(mouths): Thank You
(Superman curt nods and flies out the window)
So what do you think everyone?