I think they'll probably make more changes than they did in HG/SS. Maybe they'll add something along the lines of the Sevii Islands from FR/LG? Or change/expand on the plot to incorporate megas?
(I always forget the physical/special split didn't happen until gen IV. What were they thinking with Sharpedo in gen III???)
Ohhh dang it'd be really cool if they added something like the Sevii Islands!! Or maybe they'll do something like Elin said and it turns out the orbs are actually mega stones or something :0 Aaahhh oh my god I'm so excited!!!! I really can't wait to see what they do with the games and how they'll look and all!!! <3
ALSO WE'RE ALL FORGETTING SOMETHING
THE TRICK HOUSE FUCK YES