If you are totally in love with your Death Knight, like most of us are, then you'll want to know about these updated Glyphs!
Glyph of Death Strike: The old version of this glyph increased your power by 2%, regardless of the amount of runic power that you had. But, the new version will increase your power by 2% for each 5 points of runic power you have.
Glyph of Icebound Fortitude: The update to this glyph will grant 30%+ damage reduction no matter what your defense skill is currently. The old glyph on made it where Icebound Fortitude didn't cost you any runic power to use it.
Glyph of Plague Strike: While the old version of this glyph only did 20% additional damage when you used this spell, the new version will do 60% more damage - which is a massive amount in power change.
Glyph of Strangulate: The update to this glyph will reduce your cooldown on your Strangulate spell by 60 seconds, which mean that you'll have less time to wait to silence casters. The old glyph simply increased your range by 20 yards.
Glyph of Unbreakable Armor: The update on this glyph will actually increase the amount of damage that you can absorb by 1% when using this glyph, where as the old one only granted an additional 15% armor.