Quote fromBashiok has just responded to a user inquiry on the Battle.net forums in regards to how dropping keys would work in Diablo 3 - ie: specific keys used for specific things, instead of the more random keys that we saw in Diablo 2. Here's what Bashiok had to say in regards to the question:
So what do you think? Would you rather have random keys work in all chests, or do you like the more specific keys only working with certain things? Personally, I prefer the more specific ones because it adds an extra element of challenge. I like having to hunt for an item, battling my way through hordes of enemies. Makes it all the more satisfying when I finally get it!
I dunno, I really like the idea of chest requiring more complex keys to open them, I just think that perhaps they would be dropped more. And maybe have the super-keys being able to open the lame chests as well. Then it adds bit of a key game to the whole thing