Incidentally, we've made an Elite Sets that are specifically tailored for each character class. First of all, normal items from sets can randomly spawn in an exceptional or elite form. For instance, Beserker's Hatchet could spawn as the elite form of a Double Axe. The more exciting new implementation will be fully elite or fully exceptional sets. For each character class, there is at least one elite set specifically designed for that character.
Many classes also have exceptional sets tailored for their use.
These are, again, comprised always and only of elite items. This is definitely an improvement, which make sets more useful. Lord of Destruction, Nightmare and Hell difficulty have been rebalanced. To counteract the possibility of any character becoming too powerful because of the effectiveness of elite items, Blizzard North has changed certain elements of Diablo II, including the general level of challenge, the strength of monsters, where certain items drop, and etceteras. We've changed the balance in Nightmare and Hell modes to allow for the new items and a greater variety of tactics.