One of the initial changes in patch 3.0.8 was the inclusion of Death Knight tanking weapons that could be crafted by a high level Blacksmith. As of the latest 3.0.8 PTR update, these have been removed. And all indication is that they'll stay removed.
Ghostcrawler doesn't want Death Knights to hang onto the weapons throughout their time in Wrath of the Lich King, which is apparently what Blizzard is afraid will happen. The other issue with providing 2H tanking weapons was that Blizzard would have needed to start itemizing (putting tanking stats on and crafting gear for) 2H tanking weapons overall, and that's something they didn't want to do.
The Ghost also points out that the new sigil and runeforge enchant should be enough to get the Death Knight defense up to where it needs to be.