Batman: Arkham City - More Villains Confirmed?

Batman: Arkham City - More Villains Confirmed?

Paul Dini - Writer for Arkham Asylum wrote:
"The more we got into developing the first game, we were like, 'Hey, let's do this. Let's put in this clue for the second one.' At that point we were pretty sure we were doing a sequel at some point."
Ever since this list hit the web there has been a lot of questions raised. For example: Who exactly is Luke Oliver? But after Paul Dini mentioned dropping "clues" about the sequel in Arkham Asylum (see above) we are now able to see it in a different light.
Is this list a clue to future villains Arkham City? We have learnt from Game Informer's recent release that Two-Face & Catwoman are confirmed. Is this just the beginning of the list being complete?
Here is the list and the current villains that are confirmed.
- Selina Kyle (Catwoman) - CONFIRMED
- Harvey Dent (Two-Face) - CONFIRMED
- Jervis Tetch (Mad Hatter) - NOT CONFIRMED But hinted here
- Basil Karlo (Clayface) - NOT CONFIRMED But hinted here
- Walon Jones (Killer Croc) - NOT CONFIRMED But hinted here Warning! Original game spoilers!
- Oswald Cobblepot (Penguin) - NOT CONFIRMED But hinted here
- Arnold Wesker (Ventriloquist) - NOT CONFIRMED But hinted here
- Luke Oliver (Luke All Over? Look All Over? Could it be The Riddler at his usual tricks)
- Mr Freeze and Talia al Ghul have been confrmed by their respective voice artists, Maurice LaMarche and Stana Katic.
- The Riddler has been confirmed by Wally Wingert, who voiced The Riddler in Arkham Asylum, but it is not yet known if he will appear in person
Should certain characters return for the sequel? Who from the list would you like most to see in the game?