Bolt the Cat said:
Do I know for sure? Well not really. But there'd be very little reason for them to go the Sevii Islands route because Hoenn doesn't need that many post game areas. Ideally, what they should've done was use that archipelago of islands in the Pacifidlog/Battle Frontier area for a Battle Zone type place, but they didn't do that. The map doesn't leave much room for new areas, and since XY barely had any post game areas, it makes sense for ORAS to follow suit. So in short, all of the evidence is pointing to minimal post game areas.
I don't think so at all. Every remake has only added post game content and events... I mean, every sequel has more post-game content. Fire Red and Leaf Green had the sevii Islands (with pokemon catchable from other gens), HGSS had the pokeathalon and the battle frontier (plus the whole kanto region, and the "Sinnoh sounds" and "Hoenn sounds"). Remakes, and generally sequels or special editions, just add.
The could completely add new areas that they don't even have to show on the map... but even then, the new map does has some hopeful new looking areas. Lots of the clouded areas look like they're hiding something, Mauville city looks very new with a wall and everything, where the S.S. Cactus sank looks much bigger and expanded, and there is that whole Black shadowy part that looks like it might have something to do with Mega Evolution like the statue in Anistar city in X/Y.
Even if they don't have as many new area's to explore, their post game content is already looking much better. We have Super Secret Bases and Contests to help occupy us. If we're lucky, we could still end up with a Battle Frontier, and I don't see any reason that they won't have the other post game content they had for the original Ruby and Sapphire.
Do I think there will be new Gym Leaders and Elite Four? No, I don't think so. They MIGHT have Juan over Wallace as a leader, but I don't think they'll have anybody new. They might have expanded stories though for the characters though... maybe we will get to meet Juan after defeating Wallace and get to witness the switch of Wallace becoming champion and Juan taking his place as gym leader as post game content.
We are getting a lot of new characters already, such as Aarune and Lisia. And the redesigns of some of the characters are still very fresh and exciting.