There is a link from https://mobile.twitter.com/JTuckerAnimator/status/695877164822990848 on February 6, from James Tucker that he posted a photo of a board with a season worth of possible storylines, some unused.
**Joker and Rip Hunter in a "Doctor Who" parody,
**The Inferior Five.
**Batman and Robin vs Crimson Avenger and Wings in a Green Hornet style.
**Green Arrow gets his goatee.
**Batman and the Unknown Soldier.
**Batman and Teen Titans (Nightwing, Speedy, Kid Flash and Aqualad).
**Batman and Catwoman.
**Batman and Ragman.
**Batman and Flash (Barry Allen).
**Batman and Villains.
**Guy Gardner made evil by Sinestro into Parallax. Enter Alan Scott, the Golden Age Green Lantern.
**Aquaman and Claw the Unconquered.
**Jonah Hex and Two-Face in the Old West.
**JLI vs Royal Flush Gang/Roulette. Also Blue Beetle being recruited into the Teen Titans.
**4 Teaser Movie with the Challengers of the Unknown, Doom Patrol with Beast Boy, Metal Men and Batman.
**Batman as vampire vs Nocturna.
**Batman and Suicide Squad.
**Ditko Show (Question, Oddman and Creeper).
**Kamandi and Klik Klak.
**Superman vs JLI (with Wonder Woman).
**Supernatural heroes (Dr. Fate, Zatanna, Etrigan, Deadman and Spectre) or Wildcat vs Joker adaption.
**JLI/JSA Crisis 2-parter.