User blog comment:Matt Seay/Future of the Batman: Arkham Series/@comment-1639863-20131113114226

Kevin Conroy, Bats' voice actor in Asylum and City, has confirmed on Twitter that there is another Arkham game coming out where he will be playing Batman again. The tweet has since been deleted, but some people managed to screenshot it. Source will come soon.

I'm thinking this implies the game will be closer to Asylum and City.