I think it could go either way... but since Kiefer Sutherland didn't voice Bron in the TV series I think that Cam Clarke is probably a little more likely, especially since he's done a lot of voice acting in other roles. Still, I think if they get Kiefer Sutherland back, I think it'd be a good sign because I think he'd probably be impressed with the movie if they get him to come back.
As for the news, maybe we'll hear more after that Curious George movie is released next Tuesday, since that's probably what Universal Animation Studios is immediately focused on right now. If they are going at the same promoting pace with Journey of the Heart that they were with the Curious George movie, they'll probably start promoting LBT 14 sometime later in the summer. Or maybe they're possibly working on developing a Land Before Time 15 -- Jurassic World might have been so successful that it would encourage Universal to work on another Land Before Time because they see commercial success since they're both dinosaur movies (albeit very different genres).