Judging from the trailer, screenshots etc it is pretty obvious that ORAS will be using the same engine that XY had. However that creates a problem, the embarrassingly low frame rate that occurred whenever you entered a battle with 3D turned on. This problem is major and surely would have not gone unnoticed by Nintendo/Game Freak, surely to create the best experience the engine must be modified to allow higher frame rate when playing in 3D, especially as 3D is the gimmick of the 3DS you would expect that a game made for this console could be played in 3D without any frame rate drops. Anyway my rant is over, I'm sure there are many other improvements that need to be made, so feel free to post them down below :)