Unless you would like to keep speculating about sources of the images etc., let me explain the 'history' of all this.
About three months ago, I was first told this information, at which point I was not allowed to 'spill the beans'. That is also when I was sent this image.
Last week I visited Nintendo, where one of the points of conversation were the new Pokémon games. One of the things I discussed was what I shared with you here. Although the Nintendo rep. did not know all the details, he did know "there are going to be new battle mechanics" and "the theme of black and white involves more than just colors".
With that I returned to my source, and I was given permission to share the information. After seeing your interest on Minotauross, I asked if I could share the "concept art work" as well, which was then approved. Point is, the image was already in my posession before all this.
The whole deal with the artwork is one giant misunderstanding, where I hope to understand soon where that came from.
As far as the information goes, it is the confirmation of Nintendo themselves on "renewed battle mechanics" and "more to the theme it than just colors", in combination with a source I have come to know in the past as reliable.