So, possibilities so far:
a) Nibris doesn't exist and Cubed3 made it all up for traffic.
b) Nibris is a scam (a couple of Polish kids having fun with Cubed3) and Cubed3 fell for it.
c) Nibris is a hopeful bunch of computer geeks who WANT to develop for the Wii and DS, and though they could fake themselves into a contract. Cubed3 didn't notice this.
d) Nibris is real, but in the early stages of work, and they stupidly hired an artist who pawned off existing art OR his other stuff to them... and they never noticed.
e) Nibris is somehow real and... the art is real... somehow....maybe.... er.... the polish art site guy stole them and backdated the images?