Yeah, he said he was working on an arkham game for nine months, before Arkham Origins was even announced. Then Origins came out and didn't had Conroy in it and he said something along the lines of "I didn't mean Origins, I meant another Arkham game" in a tweet. That tweet was delayed pretty soon after.
Oh, by the way, a few days ago this photo leaked:
View attachment 96573
Apparently its from a Gamestop employee, who said they got Batman promo stuff last week. They aren't supposed to talk about it and its supposed to be used for marketing in the store beginning from march 3rd. I dunno if its fake or not, but if its not, we are getting official news on the next game in a matter of days.