My Prediction is all 3 will come in optional colors
but the 'main' color for each, the one they'll be revealed in im almost positive for PS3 will be the shinny black like the surface of the PSP. MS is an interesting one, i'd find it rather ironic that MS would release a system in that shinny white look, being that it would make something Microsoft made look like something from Apple. I think Nintendo will be in a shinny white as thier main. im almost thinking more of a Silver for MS tho. a metal look to it.