Trainer Customization better return I don't see why it wouldn't.
Just a thought what will the Game Corner be like? In HG/SS's Game Corner we only got the Voltorb flip but what turned me away is the fact in NA they removed the option to exchange money for coins. For the most part with Game Freak trying to remove the Game Corner because so many people and parents complained it influenced "gambling". Can we see less attention to OR/AS's Game Corner, possibly no exchange option for coins again?
With FR/LG getting Sevii Islands, and Battle Tower, an HG/SS getting Pokeathlon, Battle Frontier, and PokeWalker what extra's could we see in OR/AS? With OR/AS being just like X/Y we could probably see post game content like Battle Maison, and Friend Safari returning.
An could we actually see new Mega Evolutions? As much as I want this to happen I have a feeling though that there might not be any, simply because OR/AS are just remakes. Since when has a remake introduced a new Form/Evolution of current Pokemon. The whole theory that the cover art for both Groudon and Kyogre are their Mega Evolutions is probaby not true. Mega Evolution makes the Pokemon undergo a pretty big design change, many will say "What about Kangaskhan", it's baby undergo's a big change. The slight design changes in their markings are most likely new for when they interact with their orb's.