Race in the eternities

I taught Gospel Doctrine in a branch when I was first married. There was always one member of my class (and I'm sure similar ones are everywhere), who would come out with the most ridiculous, and often prejudiced things. Our Stake President was also in the class, and this same individual would always direct questions to him - me being a woman, and a lot younger than him, obviously I wasn't qualified to answer the most basic questions! Thankfully, the Stake Pres. always deferred to me. Anyway, this brother during one lesson, (I can't even remember the topic, but we were talking about people of colour - particularly black people), said "it's ok, because when they get resurrected they'll be perfected and be made white (skinned)." Many LDS artists apparently agree, as most have resurrection/after-life scenes with only white-skinned, fair haired people - but LDS art is a whole other discussion I'd like to get into another time. The issue of race is obviously still an issue for many church members today. (See Dave's Mormon Inquiry for an article on this.) Maybe I'm wrong, but I'm not aware of any doctrine and I can't find any reference to us being one race or another post-resurrection. There's Justin's opinion at Mormon Wasp (look in the comments), but does anyone know of any actual doctrine talking about this?