This link has some early reviews/responses on the new T3 at GRU. Lack of sufficient signage and the largeness of the place seem to be prominent.
http://vejasp.abril.com.br/materia/i...ampaign=vejasp
Note: in Portuguese.
This link comes into a thread where the pics posted in the OPs message are repeated, but then there are several more pages with many additional photos of T3 at GRU.
http://www.skyscrapercity.com/showth...42904&page=558
Note: Also mostly in Portuguese