Pokemon grey isn't going to be a 3DS title. That would mean they'd have tot totally revamp the game. the 3rd Pokemon game to go along with the 1st two released before it is always a slightly updated version of those 1st two. Not a totally new game, like a 3DS title would have to be.
Now as for a 3DS title I'd REALLY love to see: Endless Ocean 3DS. O_O'
Nintendo Network ID: Cheebee 3DS Code: 2320 - 6113 - 9046