We have since made another hotfix to just change the way the healing works completely. It now heals 5% of the death knight's health per disease on the target, up to a max of 15%. This should allow Frost and Unholy to benefit from Death Strike healing while letting Blood benefit from extra Death Strike damage. The tooltip will not reflect this change until we can patch the client.I was just commenting on this yesterday, but it doesn't surprise me that they are changing Death Strike again. Or even this soon. The fact they are changing it again this soon is just more evidence, in my view, that they have absolutely no idea what they are doing.
Patch 3.1.1 is going live today with one more DK nerf: