This time its going to be Gloom. ToC was a unexpected buff so it has to go down or the dev's might get a pay cut for not following corporate policies.
1st Patch : 1.0.2 = Smoke Screen nerf
2nd patch : 1.0.3 = Nether tentacles nerf
3rd Patch : 1.0.4 = Jagged Spkies/Procs nerf
4th patch : 1.0.5 = Gloom
5th Patch : 1.0.6 = I am guessing one of Preparation / hungering Arrow / Elemental Arrow / Cluster Arrow as they are currently some of the most used skills/trees.
Subsequent Patches : 1.0.7 ...= Steady Aim/Archery/Sharp Shooter/Tactical Advantage.
All is not lost though....they will probably buff some awesome skills like Brooding from 1% life regen to 1.1% life regen so that it can be shown as a BUFF in PATCH NOTES.