Based on the images I saw, it isn't fully 3d assets, nor were the older games fully 2d. many things that should be polygonated models are actually just giant image textures used for things in the distance that they never bothered to create in 3d. Additionally, the level design seems rather faulty,looping similar patterns of textures rather than mixing them up to hide the effect of it.(yes I know the gameplay isn't final, but usually companies will finish development before posting trailers. Additionally, they would only want to show polished content.)
Newer Pokemon games for the ds like black and white started using partially, 3d graphics to enhance the quality and add new functionality, they just never moved the camera angle to creation the impression of 3d.
Yeah, I remember in one of the pokemon games I told my brother to level a flying type pokemon so he could counter a gym, and he ended up leveling it so much that it became his main and his started ended up being like level 40 when his flying type was level 100 xD
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The videos I saw gave me the impression that everything was 3D. Check out this
Link
http://m.uk.ign.com/articles/2013/01...ing-in-october . The article and quotes from Nintendo as well as the trailer there make it seem like everything is 3D. Could be wrong however. I'd like them to make and release a trailer viewable directly on the 3DS in 3D as that will likely make things more clear.
EDIT: Also in the Gen V games (Black/White) they did change the camera angle on the overworld to create a pseudo sort of 3D world. Definitely more noticeable in some areas than others though.