The official patch notes on the front page say:
But I remember hearing a while ago that they were being buffed 9x or something like that. Is this correct that they are being slightly nerfed from live or is this a typo and just a small nerf to some earlier buff on the ptr? If so, how much is the buff compared to live?"Blood Parasite now summons Bloodworms with 15% of the Death Knight's health (was 18%) and Blood Burst now heals for 25% per stack of Blood Gorged (was 30% per stack)."