We are not nerfing Demonology
There are some patch notes that reference nerfs to Demonic Tactics and Demonic Knowledge. We are NOT making those changes.
There is always a risk when data mining that you pick up something incorrectly. Hunters made dartboards of us (well more dartboards anyway) when someone thought we had nerfed Wing Clip by misreading a mob ability.
But before you take it out on MMO-Champion or anyone else, these were some actual changes we were experimenting with. Unfortunately, they were part of some other changes that we have decided to not go forward with at this time and when viewed in a vacuum appear to be a nerf to Demonology.
To reiterate though, the changest to Demonic Knowledge and Demonic Tactics are not going to show up on live.
PTRs are a little like betas. We want to try some things out. We plan on updating the data a couple of times if we can.
And yes we have other warlock changes we are working on. Hopefully they will be available on the PTR as well, but no promises. Sometimes changes take time. Believe me, I get impatient too when I know changes to my class are coming. (Source)