1. Cats are easier to tame. When holding a fish they no longer run away from you and you may approach them.
2. Cats can sit now.
3. Cats drive away creepers. The creepers will approach to attack but will not come within around 7 blocks of a cat so if you keep your cat close your safe. The creeper has to be able to see the cats. Hiding cats in your floor or walls won't work.
4. All new mobs run on the better AI including creepers.
5.Villagers will open doors to enter or leave homes. A spawned villager refuses to leave my house and keeps opening doors to move between rooms. Yes they close the door behind them.
I have already tested all of these. I will post more changes as they are discovered.
Well, I had no problems at all with the old way of tamining the ocelots. Some poeple didn't but some did. I guess it doesn't work too good for everyone just like some new stuff crashes some poeple's Minecraft while thers don't. Correct me if I'm wrong.