This is the most basic unholy pvp spec around.
My DK The only thing you might change is the glyph of icy touch for glyph of disease.
Only thing though is glyph of disease is more based towards 3's and 5's, while the glyph of icy touch is more about bgs and 2's. I focus on the latter.
Also, I can tell you that the survival, control and damage burst of unholy is a lot better than frost. I did try frost pvp out for quite some time and it worked fine, I just didn't have the control or survival I wanted and eventually made the switch. Frost was fun when you had full rp and 6 runes to blast on people, but chillblains fails in comparison to desecration when it comes to a snare.