As Swampert said there is no information yet, but it is quite likely. It's also not known whether they will release remakes before or after the "third" game.
In generation III, they released Ruby/Sapphire, followed by the remakes FireRed/LeafGreen, followed by the "third" game Emerald. In generation IV, they released Diamond/Pearl, followed by the "third" game Platinum, followed by the remakes HeartGold/SoulSilver.
So it is likely they will release a "Pokemon Grey" (or whatever they call it) first, before remakes. It's not clear if Black/White will be fully utilizing the new Nintendo 3DS console, so I have a feeling that the next games will use more 3D.
Note: it's all speculation at this point!