I always found this to be the weakest gen, and least exciting to play through. Visually it was a great update to Gold and Silver, but I found it to be so much less exciting than Gold and Silver. Even still the fact that we're already getting another set of pokemon games in the new engine makes me excited. Guess this means Red and Blue/Green remakes could be made AGAIN since their first remakes were made in the same engine as Ruby and Sapphire, I find that thought a bit sad.
I would love if this game lets a pokemon follow you like the Gold/Silver remakes, and if they decided to include Johto and/or Kanto as bonus region(s) for after the main game is complete. I loved this feature from Gold and Silver, and it really sucks that it hasn't been revisited since.