W/ 2 new reveals I'm going to make some new predictions of who I think is actually left, not who I wish was left: First, Hector Sanchez previously said that the 24-slot character select screen was just a temporary placeholder. I'm going to guess 26 characters but I'd of course be very happy if it turns out to be more.
Heroes:
1-11: already reveled
12: Raven - revealed in a magazine; she was actually showing a power in the pic which suggest they created a power-set for her; many other characters seen in those magazine articles (
link) have since been revealed.
13: Robin - on comic w/ a modernized armor, on art-book cover
Villains:
1 - 8: already reveled
9: Doomsday - screenshots; magazine articles where many "also seen" characters have been revealed (see link in "Raven" above)
10: Ares - magazine articles where many "also seen" characters have been revealed (see link in "Raven" above)
11. Black Adam - quickly seen in a trailer screenshot; magazine articles where many "also seen" characters have been revealed (see link in "Raven" above)
12. Killer Frost - noob.com crossword suggest "ice girl"; ice based character was seen in original trailer.
13. Gorilla Grodd - noob.com hints; makes since as a Flash villain if Killer Frost is going to be the ice character
Likely DLC:
1. Martian Manhunter - also on art book, hinted as DLC on a twitter pic from Boon; I don't think he's in original game b/c of noob.com crossword hint
2. Lobo - mentioned by Boon several times in the context of DLC
3. Power Girl - winner of popularity poll by Boon
4. Animal Man or Swamp Thing - both strongly represented in popularity poll by Boon
5. Zatanna, Black Canary and Red Hood have all been very common character requests...I don't think NR will fail to notice this