I think it probably will come out around September or so. Anyway,I don't care, as I can change the cover of my 3ds with 3ds protective cover.
As of right now the new Nintendo 3DS will be available in the US and Japan in only two colors. We're getting black and aqua blue. I believe they will add more if demand is high.
Might be announced at E3 for the Christmas Season. More than likely they will have a package deal special for the holidays. Who knows they might even come out with a different color scheme for the release of Zelda: OoT.