The latest PTR build showed very few changes, mostly spell changes, this might be a good sign that fine tuning is taking place and a live release may be soon. Below are the DK changes and some updated tier 8 pics via MMOC.

9733 Death Knight Changes

General

None

Blood

None

Frost

Howling Blast cooldown has been reduced from 10 sec to 8 sec.
Rime now has a 15% chance to reset the cooldown on Howling Blast and cause your next Howling Blast to consume no runes.

Unholy

Death Strike damage has been lowered, it now deals …

The 3.1 PTR has finally dropped and below is a current list of DK changes and then further below that will be the rest of the patch notes. You can see all of the class changes over at MMOC.
Here are some of the random highlights:

Dual spec to cost 1,000 gold.
You can now queue to battlegrounds from any location. (no more ghetto ports?)

Death Knight Changes

General

Blood Boil’s damage increased to make up for Pestilence no longer doing damage.
Blood Boil now does some damage to undiseased targets and extra damage to diseased …

So today is patch day! But! Nothing for us… Which may be a good thing. 3.0.9 is being deployed today and there are zero DK changes. I’ll go ahead and post the notes though along with a couple interesting blue posts.
3.0.9 Patch Notes
World of Warcraft Client Patch 3.0.9
The latest test realm patch notes can always be found at http://www.worldofwarcraft.com/patchnotes/test-realm-patchnotes.html
The latest patch notes can always be found at …

For the past two or three days Eyonix, and lead developer, has been posting a three part series in the official forums outlining upcoming 3.1 class changes. Finally this morning the third part was released and along with it came the DK news.

Eyonix
We are planning a lot of exciting content for patch 3.1.0, and we are doing a three-part preview series on upcoming class changes. This is the third in the series: Mages, Paladins, Hunters, and Death Knights. Please keep in mind, that this list is not at all comprehensive, …

A new PTR build was pushed last night and and one of the biggest changes was the removal of the Blacksmithed tanking weapons.

Ghostcrawler
The two-handed Blacksmithing tanking weapons are not going to be implemented.

Indeed, we did not want to stick DKs with these weapons forever, nor did we want to start itemizing 2H tanking weapons forever. DKs were designed to tank with 2H dps weapons.

The new sigil and runeforge enchant should help players with low defense.

I’m actually relieved to know that the temptation to pigeon hole myself into a 186 dps …