Diablo 3 - Game Design Update

Blizzard posts on the official site about what they are seeing with Diablo 3, more information about the hotfix that changed some skills and their intent with upcoming patches. It's a long post but here's a small sample:

Regarding the changes to Lingering Fog, Boon of Protection, and Force Armor: we determined these skills were simply more powerful than they should be, and we felt their impact on class balance and how each class was perceived warranted hotfixes as soon as we were able. However, we don't want you to be worried that a hotfix nerf is lurking around the corner every day. If a skill is strong, but isn't really breaking the game, we want you to have your fun. Part of the enjoyment of Diablo is finding those super-strong builds, and we want players to be excited to use something they discovered that feels overpowered. A good example of this is the monk Overawe rune, which many players have identified as being quite good. We agree it's good, but we don't think it's so far out of line that we're going to swoop in and hotfix it out of existence.

When it comes to making game changes, in general, our intent is to react quickly to critical design and balance issues, bugs, and other problems that seriously conflict with our design intent through hotfixes. For issues which aren’t as severely out of line, we plan to react in a more measured fashion -- through client patches. We have a patch coming within the next week (patch 1.0.2) that has been in development since the game’s launch and is mainly aimed at addressing service issues. The first real game balance changes, outside of hotfixes, will be coming in patch 1.0.3. We expect that because the game is new, some other issues will arise that will need to be immediately addressed through hotfixes, but in general, most changes will arrive through patches.