All DKs have access to the same talents, they do not vary with your spec.
Necrotic Plague replaces Blood Plague and infects the target with a disease that does damage over the next 30 seconds and every time it ticks it tries to infect another nearby target. (Q: Can it re-infect a target?) It is applied by anything that applies the regular diseases. You also gain Runic Power when attacked by N. Plague infected opponents. Will Scarlet Fever still refresh it? Will the Weakened Blows still apply?
Defile looks like the Lich King ability. It defiles the area and increases in both area and damage (every time it does damage) over the next ten seconds. Enemies standing in the defile do less damage to you. Replaces Death and Decay.
Breath of Sindragosa uses your Runic Power to continually deal Shadowfrost damage to the enemies in a cone in front of you. It lasts until you either run out of Runic Power or you cancel it. It also applies Mark of Sindragosa, which will heal you for 5% of the spell damage dealt by afflicted enemies.