So, the theme started in 2011.
It mostly revolves around Batman, but occasionally has other heroes such as Beast Boy, Cyborg, Robin (Damian Wayne), Robin (Dick Grayson), Green Arrow, Green Lantern, Hawkman, Martian Manhunter, Nightwing, Robin (Tim Drake), Starfire, Supergirl, Superman, The Flash, and Wonder Woman.
We also have the upcoming hero(es) spoiler tagged for those whom want to wait for the sets to be released.
Jaime Reyes Blue Beetle will be released in 76054 Scarecrow's Harvest of Fear, and Katana in 76055 Killer Croc's Sewer Smash
We also have the DC villains such as Bane, Black Manta, Brainiac, Captain Cold, Catwoman, Darkseid, Deathstroke, Gorilla Grodd, Harley Quinn, Lex Luthor, Man-Bat, Mr. Freeze, Poison Ivy, The Joker, The Penguin, The Riddler, Scarecrow, Sinestro, and Two-Face.
We also have the upcoming villain(s) spoiler tagged for those whom want to wait for the sets to be released.
Deadshot and New 52 Harley Quinn will be released in 76053 Gotham City Cycle Chase, Captain Boomerang, Killer Croc and Red Hood in 76055 Killer Croc's Sewer Smash, and Killer Moth and a new Scarecrow in 76054 Scarecrow's Harvest of Fear
There have also been exclusive Minifigures in polybags 'N' whatnot.
Shazam! as a Comic-Con 2012 Exclusive
Bizarro as a Comic-Con 2012 Exclusive
Martian Manhunter in his New 52 form was a LEGO Store exclusive for spending $50 of more from March 1st to March 15th 2014.
Arsenal (Arrow) as a Comic-Con 2015 Exclusive
Target Exclusive Gift Box sets
Superboy in the 2014 Target Exclusive Box Gift Set
Lightning in the 2015 Target Exclusive Box Gift
There was the Dark Knight area of which only had two sets:
76001 The Bat vs. Bane: Tumbler Chase
76023 The Tumbler
There was also the Man of Steel with it's line of sets:
76002 Superman: Metropolis Showdown
76003 Superman: Battle of Smallville
76009 Superman: Black Zero Escape
And now the Batman vs. Superman sets:
76044 Clash of the Heroes
76045 Kryptonite Interception
76046 Heroes of Justice: Sky High Battle
There were also the Ultrabuild sets based off the Hero Factory CCBS system
4527 The Joker
4528 Green Lantern
They have released three movies since the theme started, with one in the works
LEGO Batman: The Movie – DC Super Heroes Unite Clark Kent is a bonus Minifigure for buying the Blu-Ray
LEGO DC Comics Super Heroes: Justice League vs. Bizarro League Batzarro is a bonus Minifigure for buying the Blu-Ray
LEGO DC Comics Super Heroes: Justice League: Attack of the Legion of Doom! Trickster is a bonus Minifigure for buying the Blu-Ray
LEGO Justice League: Cosmic Clash Cosmic Boy will be a bonus Minifigure for buying the Blu-Ray
They also have made two games since the theme started:
LEGO Batman 2: DC Super Heroes Unite Lex Luthor Power Suit was a bonus Minifigure for pre-ordering the game at GameStop
LEGO Batman 3: Beyond Gotham Plastic Man was a bonus Minifigure for pre-ordering the game at GameStop