Well a GS remake would be nice.
More type combinations is definatlly a thing they need to add to Pokemon (For Example: Fire/Water, Psychic/Dark, Ghost/Normal, etcetra. Remember, though, the combinations I listed may seem ludicrous, but I'm just using them as examples.).
A game that combines all of the regions into one (meaning total access to Johto, Hoenn, and Kanto and their Pokemon) would be cool to see, if it's possible.
Meh, that's it. >_<
Edit: Meh, I screwed up. I didn't pay much attention to the first post. LOL! Anyways, I don't really know what they could do to celebrate it. What can they do?