Been trying to guage the effectiveness of frosty DKs on test but they are bugged at the moment. Would be interesting if the bug went through tbh :P

They have finally converted the blood runes to death runes but it is currently impossible to use them without clicking a blood spell. If you spam howling blast it uses a frost rune regardless of whether it is on cooldown or not. If you spam necrotic it just uses unhoy runes. If you spam oblit, it uses both regardless of cooldown. So on a dummy you can sit there spamming your highest damage spell every second.

Obviously this situation will change, but considering runes in unholy take approx 9s to regen, we are going to be able to howling blast approx every 2s and use the interim GCDs for rune strike/necrotic.

The other very interesting situation is that the buff of frost strike and howling blast is quite significant. On my premade with approx 11k AP with buff up and 15% mastery I am HBing for 10.5k. Frost strike is about 12k and oblit is 13-14k. I did not have oblit glyph equipped for this test but if you add a necrotic strike to the howling blast damage, it reliably exceeds oblit damage even with the extra 20%. Of course HB and necrotic do not benefit from killing machine procs but it does leave these procs exclusively for frost strike.

I will still use Mosg's automatic hungering cold/oblit rotation, but what this effectively does is improves our single target pressure and immediate burst by 20-30% in the opening stages of an arena. If this makes it live, it may be what frosty DKs need to break the 2k barrier.