I came across this entry on Bulbapedia:
What if, in Fifth-Gen, you wander around the ENTIRE COUNTRY! ["Yet to be revealed" = Nintendo Clue???]In Diamond, Pearl, and Platinum, Professor Oak explains that Sinnoh, Kanto, and Hoenn (and probably Johto and others) are part of a larger country, whose name has yet to be revealed.
Imagine how EPIC that game would be?
- Kanto, Johto, Hoenn, Sinnoh, Sevii Island, ______ [perhaps Nintendo will add a new "state" to this unnamed country?]
In HeartGold and SoulSilver, the Sinnoh Gymleaders made cameos, as well as Hoenn Champion Steven Stone.
Instead of Easter Eggs, maybe Nintendo was alluding to them being united under one game!
LOL, just a thought....
Memory would not be an issue; following Moore's Law.
You can buy a flash card up to 32 gig's.