This
This video showcases the Unholy PvP potential of the most recent build, and frankly I am really looking forward to Unholy PvP as a result... I don't see him using Unholy Blight so I guess he didnt take it (not really a PvP talent anyhow) but we can see Bone Armour ticking away...
If anyone would like to speculate on his exact build, go right ahead.
From this video I would surmise DK damage is extremely high with stacked diseases, Obliterate and Plague Strike crits alone are absolutely devastating. Disease damage is respectable but nothing exciting.
A big problem I can see remains mobility... chasing down classes really isnt easy enough yet, I hope they buff Icy Touch to have the Chillblains effect as baseline.