Director Zack Snyder seems to have been given the key to the kingdom when it comes to the DC Extended Universe films: he's directed Man of Steel, Batman v Superman: Dawn of Justice, and the upcoming Justice League, along with serving in a production role on every other upcoming DC film.
And yet, it seems that Snyder just really wants to make a Star Wars movie. It's the only explanation I can come up with for Snyder's recently released trailer mashup of Dark Side Knight v Superjedi: Dawn of the Alliance.
The fan-film (does it count as a fan-film when you have access to the original production assets?) takes the original Batman v Superman trailer and recasts it as taking place in a galaxy a little farther away. Superman is now a green lightsaber-wielding "Superjedi" (personally would have gone with blue, but your call, Zack), whilst Batman seems to have succumbed to the side of the Sith, complete with a double-bladed red lightsaber.
"Tell me," Batman growls in a parody of the original trailer’s famous line, "do you embrace the Dark Side? You will." (I would also question Snyder’s decision to take the already violent take on the DC hero from BvS to the conclusion of Batman being a Sith Lord, but again, it’s not my video.) Various Star Wars sound bytes and ships are also scattered throughout the mashup, which does have some rather impressive production values.
This is not Snyder's first dip into the Star Wars / DC crossover world: he and The Force Awakens director J.J. Abrams traded DC and Star Wars mashups back and forth on Twitter two years ago, culminating in Abrams releasing a video revealing a Batmobile cameo on the Millennium Falcon.
So if someone from Lucasfilm is seeing this, before you send over a copyright takedown, maybe think of it as Snyder's demo reel to direct an upcoming Star Wars film? Although, on second thought, it may just be a better idea to consider some female directors instead.