Returning Heroes: Superman, Batman, Wonder Woman, Flash, Aquaman, Green Lantern (either Hal Jordan or John Stewart), Martian Manhunter, Green Arrow, Shazam, Hawkgirl, Zatanna
Returning Villains: Lex Luthor, Harley Quinn, Killer Frost, Sinestro, Deathstroke, Black Adam
New Heroes: Black Canary, Firestorm, Vixen, Captain Atom
New Villains: Cheetah, Black Manta, Gorilla Grodd or Reverse Flash, Despro, Vandal Savage, Shadow Thief
Unplayable Bosses:
-Amazo (Sub-Boss)
-Reach Invasion (Sub-Boss)
-Trigon (Boss)
-Mongul (Boss)
-Darkseid (Boss)
That's all I can think of. I don't know any other magic-based villains from DC Comics.