We know what's been changed. Your opinions are irrelevant.
Scourge Strike: Redesigned. The base ability now deals 50% weapon damage plus an additional amount as physical damage. However, for each disease the death knight has on the target, the target will take additional shadow damage equal to 25% of the physical damage done.
Death Knight Tier-9 4-Piece Bonus: This set bonus no longer grants Frost Fever a chance to be a critical strike. It still grants that possibility to Blood Plague.