Regarding Orlgin's DND based DW build, I've been playing around in Excel to try and come up with a decent rotation. A couple things that came up while working on this:
1) Note that I performed testing using 1.5s GCD increments. This isn't correct, but made the math much easier to work with and should by off only by an immaterial amount, i.e. less than 1 GCD.
2) While experimenting with my previous build, I noticed that with similar buffs to IT as this build (the exception being the boost from Impurity), Heart Strike, even with a 1H weapon, was performing more damage. The same should hold even more true for SS as it has a lower weapon % coefficient and a higher constant damage boost, which helps close the damage gap between 1H and 2H strikes. Since the PTR is down I can't test it, but it might be worth considering including in order to fit rune usage into the rotation in such a way that allows for DND to be cast every 15s. I wouldn't be surprised if it equaled or even outperformed IT+PS in regards to damage. In addition, with 4pT7 it supplies a boost of runic power. We also get the benefit of the Sigil of Awareness, which should contribute more than Frozen Conscience, and of improved damage scaling with 4pT8.
The rotation below, broken into two 15s segments, assumes a starting RP of 10 from HoW and will generate an excess of 20 RP over the course of both segments, allowing a constant rotation from there on, filling in an empty GCD once a minute. Note that without points in Epidemic, Blood Plague falls off for about 2 GCDs, but those are the only dead GCDs in the rotation, so it shouldn't have a noticeable effect.
Assumptions: Blood tap is used every minute, 4pT7.
DND-PS-IT-IT(BS)-UB-DC-SS-DC-BS
DND-HoW-PS-IT-SS-BS-DC-DC
Talent/Glyph build
EDIT: Made one adjustment to the rotation that assumed Reaping as a talent. Converted an IT that required Reaping to a BS and updated some errors in the above text and rotation.
EDIT: Tested this build tonight on the PTR boss dummy with the following stats:
Weapons: 2 x Last Laugh (FC/CG)
AP: 3783 w/ HoW, 4103 w/ full Five Flights stack
Haste: 11.89% (no Icy Talons buff)
Hit rating: 307
Expertise 16/26
Crit rate: 28.05% w/ HoW
Averaged 2836.5 DPS which doesn't include Necrosis or the Ghoul; Ghoul was bugged and was unable to be controlled, dismissed, or resummoned. Not sure what people are seeing for bonus Ghoul damage on the PTR so far, but I would venture to guess that with the Ghoul and Necrosis included it should bump that number up to around 3.3k at least, and that total is with a lot of sub-optimal gear on the version of my DK that's on the PTR.
% Breakdown was as follows:
DND - 22.3%
Melee - 20.2%
DC - 13.8%
SS - 9.9% (NOTE: Largest SS hit tracked was for 7,525, largest PS + largest IT was for 5,919)
Frost Fever - 7.6%
Blood Plague 6.7%
UB - 6.4%
IT - 5.5%
BCB - 2.9%
BS - 2.5%
PS - 2.2%
One thought, I noticed that UB does only slightly more damage than a non-crit DC to single targets. I wonder if it wouldn't be worth just converting UB to another DC and moving that talent point back into BCB for a bit of extra DPS.