They did, but I highly doubt it'll happen. Probably just easter egg name drop stuff since they got access to the Batman property. If it happens at all, I'm sure it'll be a different person just like they did with Cicada's change. ie it won't be Bruce. It'll be weird after their "no more speedsters" statement if they have another evil speedster the next season, but realistically, no one else in his rogues gallery can last over a 23 episode run.
uh I don't think anyone expects it to be Bruce, everyone's assuming it would be Oliver now that he's about to be a free agent. It would make sense to give him the back half of next season because it would be a literal representation of Barry's guilt over Oliver's death.
As far as no more speedsters go, that statement is obviously isn't going to stick. It came from an ousted producer years ago, and as far as I can tell the two statements were "probably done with speedsters" and "definitely not in S4", and the latter is true and Godspeed just happened. They'll go back to that well if they need to, and two seasons off is a fair amount of time.
There's not many Flash villains left who could carry a season but if they go wider DC they could find someone. I wanted them to give Neron a shot, but Legends got him instead.