Some big changes are coming with the Diablo III v1.0.5 patch, not the least of which are changes to the defensive abilities of all characters and the monster damage dealt by Inferno level monsters. Most significantly, Wizards and Barbarians utilizing specific defensive skills will be impacted. However, all classes will be seeing improvements in defensive abilities across the board.
Alright, so let's recap. Defensive skills are taking a hit in 1.0.5, but incoming damage from monsters is also being reduced. Taken together, the changes mean Inferno is going to be easier. For some of you this is totally cool; you welcome an easier Inferno because it’s about efficiency and not difficulty. For others, you may be skeptical but you're at least intrigued at the possibility that you'll be able to drop some defensive skills and discover some new builds. However, for others, Inferno is currently already too easy. Maybe you don't use any defensive skills; maybe your gear is so good you dropped War Cry - Impunity weeks ago. For this last group you may be wondering "Another Inferno nerf? But I crave more of a challenge, not less!"
Rest assured those who seek additional challenges. They will be incoming in v1.0.5 and will be detailed at a later date.
Read the full blog post on the Diablo III site.