You may not realize this, but Zack Snyder is a huge Star Wars fan. He is such a big admirer that he posted an amazing picture that mash up both BvS and Star Wars!
A little better look at the image…
Snyder took an image of Batman from BvS, where he’s standing in the broken remains of Wayne Manor, and placed a lightsaber in his hand. The red, double-sided lightsaber belonged to the famous Star Wars villain from The Phantom Menace, Darth Maul.