I´m running this specc für 10 days now and it works very well. Only difference is that I left out UB and 1 point in Desecration to max out Morbidity. I already own the new DC/FS-Sigil and beating dummies showed better numbers with DC>UB.
Currently our raid is running 3 DKs (+1 Tank DK) -the other 2 are 0/10/61- and our damageoutput seems very similar which means @ one try I´m leading and the next try the other one´s on top.
Rotation starts like any other unholy build:
PS-IT-SS-BS-BS
after that it´s just a priority-system:
diseases (watch your glyph proccs)>SS>DC>BS
Runes are FC/FC and using SS would prefer a slow/fast setup. 4 pieces of T7/7,5 help a lot. I don´t want to make a forecast on the upcoming nerf to the T7-bonus, but atm I´m having some free seconds based on rune cooldowns to close RP-gaps by using HoW.
Edit: I´m a little confused about your rotation, darthbuddha.
PS>IT>SS>BBx2>DC/UB>SSx2/3>PEST>BB
If you use an unholy-specc as posted above, you don´t produce deathrunes by using BB. And what´s that pestilence for? Do you use SS without the glyph?