^ You know... the fact that new pokemon are released it means that are new games comming...
BUT as you could notice... every set of new pokemon have been released not only in new games but also in new consoles
so maybe new DS or portable nintendo sistem is on the way
In the case of mixing locations like in Heart Gold and SoulSilver... i dont think it will happen on the games with the release of new pokemon... maybe in the alternate editions like heartgold, soulsilver, leafgreen and firered and those will come after the special edtion of the new games like Emerald, crystal, yellow and platinum
so maybe in like 4 years =S