Theyd probably only be remaking Emerald. Why? My first point:
In HG/SS If you go to the top of the Gamefreak building, and talk to the head of business, he says that they currently are remaking ONE game that is sure to bring back memories. At the time he was wearing a GREEN suit. Second point of mine was the guy in one of the Resort Villa's in Platinum. So far he has said everything that has linked to game remakes.
First He talked About Whirl Islands and Lugia
Then He talked about The Tin Tower and Ho-oh
And lastly, He talked about the Rocket to be Launched in HOENN.
If you guys can remember, the Rocket was only finished being built in EMERALD.
My third point of proof is in Hearthome City. In Diamond ad Pearl, if you go to the cathedral there and talk to the man, he speaks about how this place soothes the HEART and SOUL. Then if you return in Platinum, there is a different girl. She says the same thing, except how this place soothes the MIND. Now its not much of a hint, but its still important how HEART and SOUL was made into games, but not yet MIND.
My fourth point. In HG/SS, If you go to Cerulean Cave, you notice that there is GREEN ROCKS. These would be Pre-Emerald Formations. Studies show That Emeralds are first GREEN ROCKS, and they turn into Emeralds when The CONDITIONS ARE RIGHT. If you go further into the cave, They are closer to becoming Emeralds, but not quite yet. But now in Black and White, in Yakon's Gym (5th Gym), The EMERALDS there are perfect and gleaming. Theyre possibly showing that the CONDITIONS are right and The new remake is going to be announced soon.
And lastly, my 5th and CURRENTLY last point. Has anyone noticed why Lugia and Ho-oh arent version exclusive in HG/SS, but Groudon, Kyogre, Latias, and Latios are? My guess is that Ruby and Sapphire are symbolically remade already (In HG/SS). Groudon and Latios are found in SS, and Kyogre and Latias are found in HG. Why are the Hoenn Legendaries exclusive? As stated before, HG/SS is SYMBOLICALLY Ruby and Sapphire. That means the elements of the game are there, just not the full story.
So I come to my conclusion: There is a great chance that Emerald is going to be remade. Possibly as MindEmerald. (No matter HOW stupid of a name that sounds.)