Honestly, there isn't much need for a Crystal or Yellow remake right now. Its already been stated that no new remakes were being planned at the moment either. Everything they would want to add in a Crystal Remake, they can simply put into HeartGold and SoulSilver. I mean yes, Crystal does come with a bit of a different plot than what Gold and Silver had in a way, and they probably won't convert much of these remakes to match that of Crystal's original plot, but it doesn't mean somethings that were added in Crystal can't be included in the new HeartGold and SoulSilver. I think having a Crystal remake would be too much anyway and would just keep back time for us to move on into the next generation. Though, I'm hoping they take their time with the next set of generation games, I think HeartGold and SoulSilver would pretty much keep people busy at the time. Plus, Platinum isn't considered an older third party game of Diamond and Platinum as yet. People are still trying to get the game, even here in the states. So, I consider having a Crystal or even Yellow remake isn't at all necessary. Though, I wouldn't be surprised in the [near] future someone will come up with a ROM Hack of a renewed Crystal like some have said. It is pretty possible for that to come to part, but I doubt GameFreak themselves will spend the money to remake Crystal when we can get everything we need in HeartGold and SoulSilver.