The Black iPhone 5 isn't going to be any different, and will still show a ton of fingerprints. It's just one of those things that goes along with the Black model.
My black iPhone 4 doesn't show any fingerprints. At first it did but now it doesn't.
Personally, I was planning on going white with this model but the White+Silver combination really messed it up for me. I would have preferred it if they had gone with one or the other. Anyhow, Slate+Black iPhone FTW!