Diablo III: Reaper of Souls

The Hydra nerf was to accommodate a new attack speed buff along with it scaling its speed with your APS. Previously, Hydra would do a constant 10 sets of attacks per full duration (i.e. 30 projectiles), or 7 attacks for Mammoth. The damage would automatically scale itself to your DPS stat. Given how good people are saying it is now, it might still do that.

That's kind of unfortunate, because Fire Wizards want as low Attack Speed as possible.