I started playing after Burning Crusade launched, so I don't have any personal history with the rage normalization fiasco that happened in the transition to BC. I'm told by old warrior hands that it went something like this:
Blizzard: We're normalizing rage.
Warriors: What does that mean?
Blizzard: It means that normally you won't have any.
Warriors: ... oh.
Right now, all of what we know concerning rage normalization for Cataclysm can be found in this post here. I won't repeat stuff we already know but try to look into how the changes will affect bear tanking. Rossi covered the expected effect on warriors yesterday, and while we share a number of these changes, there are a few wrinkles that I expect will have a specific impact on bears.