Making a fake logo is probably incredibly easy. And if the Japanese logos are something to go by (most likely not, as sometimes the Japanese logos have things not on English logos-see FR/LG, they had the fire and the leaf on the Japanese logos but not on the English ones-I think HG/SS is the first game to do this -correct me if I'm wrong) then there may be red/blue on the logos.
See fake box art, there have been many made, and while they look convincing (I saw a brilliant HG one somewhere), they are undoubtedly fake. Just wait, I bet a few 'leaked' box art images will be cropping up soon.
EDIT: Look what I found http://www.3dsvlog.com/2012/02/26/pokemon-black-and-white-2-box-art-mock-up-and-u-s-release-date/ , http://vgboxart.com/view/45936/pokemon-black-version-2-cover/ (There are more, but they are either incredibly similar with only minor details changed or exactly the same.