I haven't heard any details, but adding in a new ability system seems like a good move. IV's gameplay is terribly outdated for RPGs and I think if they made something kind of like IX it could work really well. Also I hope the expansion of the story is significant since you'll need time to develop abilities and last time I completed IV in about 17 hours. I'm really looking forward to this game, it reminds me that I need to get a job lol.