I know, Pokemon SS looks like upscaled Pokemon SM (And indicates that SS uses same engine as SM). But You should keep in mind that Pokemon SM pushed the 3DS to its
limits and it results in low framrates or lack of triple/rotation battles and maybe even number of new Pokemon (Also in XY).
But now I am little bit optimisc because SS may won't have a technical issues like in previous titles and will have triple/rotation battles again. And who know, maybe more new pokemon and more content of post game.