I just read some blue posts on how some of the new changes are being dealt with. One change is Howling Blast now has a set rate on when it can go off. This is called PPM. All classes have this including Death Knights, but it seems they are altering it now to where you do not need a fast weapon to make it go off according to Ghostcrawler.
Killing Machine is a “ppm” now or a proc per minute. That means it will proc 5 times a minute with 5 ranks, depending on your weapon speed. We generally use ppm when we do not want players to
gravitate towards faster weapons with the sole purpose of improving proc rates.
Killing Machine now is based on autoattack hits, not crits. Overall the random element will decrease, but it won’t greatly benefit faster weapons. It will still benefit dual wield, just not as much.
Summon Gargoyle has also been changed, as Blizzard has reduced it’s time to 30 seconds and does about 20% less damage now. I do not see many Death Knights picking this up anymore because of the less damage he does. While I do not mind the time limit change as I use it when the boss is at less than 20% health.
Necrosis has been buffed by an extra 10% of shadow damage. While I can see this helping, this ability needed a bigger buff than 10%. It does almost no damage now, come patch day it will do a little more. Another waste of a talent for Unholy it seems.
And for everybody who likes to use Anti Magic Zone, well the spell has been shorten to 10 seconds from 30 seconds.
In general it looks like Death Knights are getting a big nerf for their DPS, while tanking is getting a nice sized buff. I am not sure how this will effect the community at large, but I do not think we will see as many Death Knights as we are used to.